60 BULLETIN 2 01, UNITED STATES NATIONAL MUSEUM 



mens referred to B. rostrata by Illig are the same as those here re- 

 corded, and I have preferred classifying them under Illig's name to 

 introducing a new name into literature. I figure the telson, uropods, 

 antennal scale, and endopod of the second thoracic limb of a large 

 female specimen (fig. 12, a-d) , as well as the anterior end of a female 

 both from the dorsal and lateral aspects (fig. 11, a,b). Hansen gave 

 the specific name inermis to his specimens in reference to the very 

 short unarmed portions of the outer margin of the outer uropod. 

 Hansen describes it as apparently without spines at the junction of 

 the unarmed and armed parts. In all my specimens there is a single 

 spine marking the distal end of the unarmed portion and Illig figures 

 a similar spine in his specimens. I should suggest that it had become 

 broken off in Hansen's specimen. It should be noted that there is a 

 single spine on the inner margin of the inner uropod near the stato- 

 cyst (fig. 12, d). The fully grown males measure 29 mm., a size 

 considerably in excess of that given by Illig and Hansen for their 

 species, namely 16 to 18 mm. 



Subfamily Siriellinae 



Three pairs of oostegites in the female; labrum much longer than 

 broad, with a very long frontal process ; thoracic limbs with the carpal 

 joint of the endopods distinct and the propodus either undivided or, 

 generally, divided by a single articulation and terminating in a brush 

 of stiff peculiarly serrated setae surrounding the "claw," usually con- 

 sisting of the dactylus and the real claw, and very strong (except 

 in the first pair in Hemisiriella) ; pleopods of the male well developed, 

 with biramous pseudobranchiae, exopodites or endopodites or both, of 

 the third or fourth or both, male pleopods with some of the terminal 

 setae modified; exopods of the uropods divided by a feeble articula- 

 tion, the proximal part of the outer margin armed with more or fewer 

 spines but no setae ; telson entire, without distal cleft. 



Remarks. — Two genera, Siriella and Hemisiriella, are included in 

 this subfamily and both are represented in this collection. The genus 

 Siriella is enormously abundant in the tropical inshore waters and no 

 fewer than 14 species and one variety are here listed. 



Genus SIRIELLA Dana 



Siriella Dana, 1850, p. 130. 



SIRIELLA THOMPSONII (H. Milne-Edwards) 



Cynthia thompsonii H. Milne-Edwakds, 1837, p. 462. 



Siriella thompsoni G. O. Sars, 1884, p. 40 ; 1885, p. 205, pi. 36, figs. 1-24. 



Siriella thompsonii Hansen, 1910, p. 31. — Tattersaix, 1926, p. 9. 



Occurrence. — East coast of North America : Bache, George Bank, 

 11 a. m., September 15, 1872, 1 immature female; Bache stations 10194, 



