78 BULLETIN 2 01, UNITED STATES NATIONAL MUSEUM 



Endopod of the uropods (fig. 20, g) distinctly shorter than the 

 exopods with a row of spines extending from the statocyst to the 

 distal end, rather irregular, and arranged in groups distally. 



Exopods (fig. 20, g) of the uropods with the proximal joint 2y 2 

 times as long as the distal, with 10 spines occupying more than half 

 of its outer margin; distal joint twice as long as broad. 



Telson (fig. 20, /) three times as long as broad at its base, of the 

 form and shape characteristic of the genus, apex armed with one pair 

 of long stout spines between which are three small equal spinules and 

 a pair of plumose setae; lateral margins armed with three strong 

 spines near the base, followed by a short unarmed portion and then a 

 more or less continuous row of spines to the distal end, the spines 

 arranged in groups, especially distally. 



Pleopods of the male with modified setae on both rami of both the 

 third and fourth pair; third pair (fig. 20, d) with both rami terminat- 

 ing in two modified setae, one stout and straight, the other almost 

 equally stout but bent into a strong hook; penultimate joint of the 

 exopod with a short spine at the outer corner; fourth pair (fig. 20, e) 

 with the endopod terminating in two stout straight plumose setae, one 

 slightly shorter than the other ; exopod terminating in a single straight 

 plumose spine and a short simple seta. 



Length of adult specimens of both sexes, 7 mm. 



Type lot.— U.S.N.M. No. 81255, from San Jose, Panama. 



Occurrence. — The type lot, San Jose, Panama, 5 fathoms, January 

 25, 1916, collected by Dr. Th. Mortensen, 3 females, 2 males. 



Distribution. — Known only from the coasts of Panama on the Pacific 

 side. 



Remarks. — S. panamensis is distinguished from the other American 

 species by the strongly hooked spine on the distal end of both rami of 

 the third pleopod of the male. 



SIRIELLA AEQUIREMIS Hansen 



Siriella aequiremis Hansen, 1910, p. 40, pi. 3, figs. 4a-c ; pi. 4, figs, la-1 ; 1912, 

 p. 194.— Tatteksall, 1911a, p. 122.— Colosi, 1919, p. 6; 1920, p. 236, pi. 18, 

 fig. la.— Coifmann, 1937, p. 3. 



Occurrence. — Philippine Islands: The Albatross collected 1 im- 

 mature specimen at Busin Harbor, Burias Island, by electric light at 

 the surface, April 22, 1908 ; material was received from Albatross sta- 

 tions 5195, surface, 20 females, 18 males, adult, breeding (one specimen 

 with an epicarid parasite resembling Da jus siriellae) ; 5435, surface, 5 

 immature specimens; 5540, surface, 7 females, 3 males. Celebes: 

 Albatross station 5601, 3 males, 2 females; 5611, 9 males, surface, 16 

 females, breeding. Southwest Coast of Mexico : Albatross station 

 4592, identified by H. J. Hansen. Pacific :* A specimen was identi- 



