Page:The Eurypterida of New York Volume 1.pdf/119

Eusarcus scorpionis

Neanic stage [pl. 36, fig. 1]

1. Wider preabdomen
2. Wider postabdomen

Eusarcus (?) cicerops

Nepionic stage [pl. 36, fig. 9]

1. Carapace triangular with
   2. Spinelike prolongations of frontal and genal angles
   4. Immense, diverging eyes
   6. High median crest or glabella
   8. Broad, thick border

Pterygotus macrophthalmus

Neanic stage [pl. 69, fig. 3, 5]

1. Larger compound eyes
2. Larger ocelli and more prominent ocellar mound
3. More rapid contraction of preabdomen
4. Larger swimming feet
5. More spatulate telson

Pterygotus globiceps

Nepionic and neanic stages [pl. 81, fig. 1–5]

1. Very large carapace and very small abdomen
2. Smaller number of abdominal segments
   The larval eyes are in this form relatively not larger than in the adult, but provided with a prominent ring (orbital ridge)

Hughmilleria shawangunk

Nepionic and neanic stages [pl. 64, fig. 1–13]

1. Larger (longer and broader) carapace
2. Much larger compound eyes
3. Larger and more prominent ocellar mound
4. More slender abdomen
5. Smaller number of (preabdominal) segments