432 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



the general hairiness of the Academy specimen is about the same as that of your 

 specimen makes me suspicious that the tuft referred to has been removed. The 

 antenna* and antennules differ in no essential respect, so far as I can see. The 

 chelipeds of the type specimen I am, unfortunately, unable to find. 



Description. Body narrow, elongate, 

 gradually widening somewhat from the 

 anterior to the posterior extremity. 



Head but little narrower than the first 

 thoracic segment and about twice as wide 

 as long; frontal margin slightly excavate 

 and without median process between the 

 antennae; lateral margins straight, with a 

 small lobe on either side near the base of 

 the head. Eyes lateral, situated in the 

 median transverse line. First pair of an- 

 tenna? reach the extremity of the peduncle 

 of the second pair of antennas; flagellum 

 consists of about ten joints. 

 Second pair of antenna? are 

 about two-thirds the length of 

 the body; the flagellum con- 

 sists of about 55 joints. 



The first segment of the 

 thorax has the epimeral lobes 

 distinct and visible from a 

 dorsal view at the antero-lat- 

 In the second and third seg- 

 ments the ephnera are bilobed and occupy the anterior 

 portion of the lateral margins. In the fourth segment the epimeron 

 is a small lobe situated at the antero-lateral extremity 

 of the segment. In the fifth and sixth segments the 

 epimeron is a small lobe about the middle of the lateral 

 margin. In the seventh segment it has more of a pos- 

 terior position on the lateral margin. 



The abdomen is broad, with the sides nearly parallel. 

 Posteriorly it is produced in the center in a large tri- 

 angularly shaped lobe with rounded apex. The uro- 

 poda are slender appendages; the peduncle is somewhat 

 shorter than the branches. The inner branch is about 

 a fifth longer than the outer branch. The margins of 

 all the segments, the uropods, and the legs are fringed 

 with hairs. 



The legs of the first pair are subchelif orm ; the pro- 

 podus is elliptical in outline, with the inferior margin straight. The 

 other legs are similar and ambulatory in character. 



FlG. 487. ASELLUS TOMALENSIS. X 9. 



eral angles of the segment. 



FlG.488. ASEL- 

 LUS TOMALEN- 

 S I S. M A N - 

 DIBLE. 



FlG. 489. A8ELLU8 

 TOMALENSIS. LEG 

 OF FIRST PAIR. 

 X 20i. 



