■116 CARCINOLOGICAL STUDIES. 



Clih. longitarsus de Haan finally is more densely hairy 

 and the hairs are much longer. The hands of the 

 male are slightly unequal, and scarcely so are those of the 

 female. The hands of this species are covered on the palm only 

 with flattened, hairy, little prominent granules, like the 

 wrist and the arm, and a few small and acute spines are 

 only observed on the inner margin and on the fingers ; 

 these spines are , however , comparatively smaller than those 

 of Clih. taeniatus , olive-green and never white. The V-shaped 

 groove on the anterior part of the cephalothorax is distinct, 

 but rather indistinct in Clib. taeniatus. In specimens of Clib. 

 longitarsus , preserved in spirits , the anterior part of the 

 cephalothorax and the legs are dark olivegreen , some- 

 times with a reddish tint. The ground-colour of Clib. tae- 

 niatus^ on the contrary, is a pale yellowish red. The cephalo- 

 thorax and the chelipedes of Clib. longitarsus are not marked 

 with longitudinal lines and the legs of the second and 

 third pair agree more closely with Clib. striolatus , as 

 regards the coloration , and they present a f i n e blue 

 longitudinal band on the middle of the outer surface 

 of the joints. 



39. Alp he us pachychirus Stimpson. (PI. 6, fig. 14). 



Alpheus pachychirus , Stimpson, Proc. of Acad, of Natural Sciences 

 of Philadelphia, 1860, p. 30. 



Two young specimens from Tahiti , a male and a 

 female, the latter ova-bearing, are in the Collection. 

 These two individuals do not fully agree with Stimpson's 

 description , but the slight differences are to be ascribed to 

 their younger age. This species indeed , according to Stimp- 

 son, attains a length of 25 mm., but our two specimens, 

 at least the male, only measure two thirds of that length. 

 The anterior margin (fig. 14) of the cephalothorax is rather 

 broad and appears at first sight truncate and entire ; when 

 examined by a magnifying glass of sufficient power, one 

 observes, however, that the upper surface of the cephalo- 



Notes from, the Leyden ÜMuseum , Vol. XII. 



