MUSEUM OF COMPARATIVE ZOOLOGY. 



371 



Body thick. Hind margin of the sixth thoracic to the third abdominal 

 segments inclusive produced into a spiniform tooth on the median dorsal 

 line. Eye nearly round. Epimera of first four thoracic segments quadri- 

 lateral, their lower angles rounded. Infero-posterior angles of the first, sec- 

 ond, and third abdominal segments prolonged backward. Peduncle of first 

 antenna reaching the middle of the last segment of the peduncle of the 

 second antenna; length of entire first antenna two thirds the length of 

 second antenna. Second antenna equal to distance from front of the head 

 to fifth thoracic segment; basal segment and olfactory denticle conspicuous. 

 Carpopodite of second pair of legs in the male produced below ; propodite 

 broader than long, palm nearly straight, with a projection at its lower end. 

 (In the female the propodite is small, as usual in this sex.) Seventh pair of 

 thoracic legs of moderate length, not extending much beyond the telson when 

 stretched backward. The last pair of caudal stylets reach a little way be- 

 yond the telson, which is broad and entire. Length, exclusive of antennae 

 and caudal appendages, 7 mm to 12 mm - 



Llampopata, 10-20 fathoms, 11 specimens. 



Allorchestes longipalmus, sp. nov. 



Fie. 29. 



Fig. 30. 



Figs. 29-31. Allorchestes longipalmus: 29. Female (nat. s. limn 

 ■g of male. — 31. Shell seen under a high magnifying power. 



■30. Part of 2d thoracic 



Hind margin of fifth thoracic to third abdominal segments produced into 

 spine-shaped teeth on the median line of the back. Eye round. Epimera 

 of the first four thoracic segments quadrilateral, their lower angles rounded. 

 Infero-postejifcr angles of the first three abdominal segments produced bo- 



