Boone, Crustacea, Cruise of ''Alva," 1931 105 



Both males and females have on the median ventral surface 

 of the second abdominal segment a strong procurved tooth, which 

 is not cited in the descriptions of any other species of Acetes. 



The petasma is carefully figured by Kemp {loc. cit.) . There are 

 no adult males in the present series. 



The adult female has the thelycum located principally on the 

 third thoracic sternite with the anterior margin deeply sunken, 

 concave transversely; this sternite is deeply channelled longi- 

 tudinally, this channel being continued onto the anterior portion 

 of the fourth segment. There is a pair of submedian, rounded 

 tubercles, one on either side, behind the inner angles of the coxal 

 joint of the third pair of legs. (Text, fig. 8c.) 



References: Acetes indicus, Edwards, H. Milne, Hist. Nat. 



Crust., t. II, 1837, p. 430. — Kemp, Stanley, Rec. Indian Mus., 



vol. XIII, May, 1917, p. 47, figs, la, b, 2a, 3a, 4a, 5c, 7a) ; 



Mem. Asiatic Soc. Bengal, vol. VI, 1918, p. 295. 

 ? Acetes indicus, Dana, J. D., Rept. U. S. Explor. Exped. Crust., 



vol. XIII, pt. 1, 1852, p. 608.—?, Walker, A. 0., Journ. Linn. 



Soc. ZooL, vol. XX, 1890, p. 112.—? Henderson, J. R., Trans. 



Linn. Soc. Zool., ser. 2, vol. V, 1893, p. 452.—?, Pearson, J., 



Rept. Ceylon Pearl Oyster Fisheries and Marine Biol., pt. 4, 



1905, p. 75. 



Family: PASIPHAEIDAE 



Genus: LEPTOCHELA Stimpson 

 Leptochela pellucida new species 



Plates 26 and 27 



Type : An adult female dredged in 14 fathoms, near Equator, 

 to the south of South Brother's Island, south entrance of Durian 

 Straits, Dutch East Indies; Lat. 29' N. by E., Long. 104° 47' E. 

 Deposited in the Vanderbilt Marine Museum, Cat. No. 735. 



Material examined : Type. 



Distribution : So far restricted to the type locality. 



Technical description: Adult female: Carapace decidedly 

 compressed laterally, elongate, smooth, except for the distinct 

 median dorsal carina that arises about one-third of the carapace 

 length from the posterior margin and continues forward as a com- 

 pressed ridge, becoming accentuated distally as a folded or carin- 



