8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



symmetrically grooved, and with the exception of the sixth, are orna- 

 mented on the epimeral region of either side with a pad or felt of hair. 



The telson is about one and one-half times as wide as long, and a 

 little less than half as long as the sixth abdominal somite ; the telson and 

 the sixth somite are ornamented with hair tufts about as in C. major, 

 but otherwise the two are of very different shape. The telson of C. isla- 

 grande is truncate or more or less sciuared-oft' posteriorly, and but little 

 contracted anteriorly ; medially there is a longitudinal, smoothly 

 rounded, raised area, but lower than the inflated lateral portions of 

 the dorsum of the telson, which is bounded laterally by bowed-out, 

 smooth grooves or depressions confluent behind but separating again 

 to pass either side of a rounded, raised area, the pushed-up median 

 portion of the hind border of the telson; the outer uropod is more or 

 less triangular with but gently convex posterior margin, the inner uro- 

 pod is narrow, tongue- or strap-shaped, distally rounded, and nearly 

 four times as long as wide. 



In the useful key given by de Man " our species would take place 

 alongside of C. major, having, like it, very narrow inner uropods, 

 about four times as long as broad, and, to use his expression, almost 

 sty li form. However, the different eyestalks, the remarkably elongate 

 larger chela of the male, and the character of the telson sharply differ- 

 entiate C. islagrandc from that species. 



The females need no separate description ; their chelipeds are both 

 much like the minor cheliped of the males. 



T3'/>^.— U.S.N. M. no. 69362, the largest of 10 specimens {■^^, 65) 

 collected by William W. Anderson at Grand Isle, La., in the summer 

 of 1930. It is a male, measuring approximately (in millimeters) : 

 carapace 19 long, abdomen 62 exclusive of telson, telson 6 long by 

 8.5 wide. The larger right cheliped measures: ischium 21, merus 17, 

 carpus 30 (greatest width 6.5), hand on upper margin 19. The ex- 

 treme forward reach of the movable finger from the articulation to the 

 summit of the tooth on the upper outer margin of the finger measures 

 10 ; from articulation to tip this finger measures only 8.5. The smaller, 

 left cheliped measures : ischium 9 ; merus 8 ; carpus 11, width at middle 

 4.8 ; palm, upper margin 5, width at middle 3.5, lower margin to tip of 

 fixed finger 7.3 ; movable finger from articulation to tip 6. 



I have also seen a lot of 10 females collected by Dr. Ellinor H. Behre 

 at the same place July 5-17, 1928, and a male taken July 15 of the 

 same year by Mr. Anderson. 



Siboga-Exped. Monogr. 393", p. iii, 1928. 



