Mr H. Goodsir on the Sexes of (he Chripeds, ^c. 93 



Tho first segment of the crustaceous portion is the largest 

 of all the six, and is of a semicircular shape. It supports the 

 masticatory apparatus, two pairs of antennae, tho two eyes, a 

 pair of strongly pectinated organs, and a pair of long, sharp, 

 claw-like members. (Plate III., Fig. 3, a.) 



The eyes are large, shining, black, and pedunculated, and, 

 as far as could be made out, were to a certain extent mobile. 



The first or anterior pair of antennae are each composed of 

 a single large, flat, scale-like joint, which has its extremity 

 armed with seven or eight long, delicate filaments, the two 

 first of which are biarticulate. Each of the external antenna; 

 consist of nine joints, the two first of which may be considered 

 as peduncular ; the last seven are much more delicate and 

 slender, and have each of them a spine at the distal and an- 

 terior extremity ; the ninth has the extremity armed with two 

 or three long and very delicate spines. 



The mouth is situated at the posterior part of this segment. 

 It appears to be suctorial ; but, from the extremely minute 

 size of this portion of the body altogether, this has not as yet 

 been made sufficiently out. 



A very strongly pectinated scale arises from the base of the 

 first pair of antenna), one on each side. These arise almost 

 from tho mesial line, and cover the anterior antennae. The 

 posterior edge is armed with seven or eight long, sharp, and 

 powerful teeth. Another pair of strong claw-like extremities 

 arise from the base of the anterior antenna?, which last are 

 directed backwards. 



The feet are ten in number, five on each side. Each of 

 them consists of six articulations, the last of which is armed 

 with a strong terminal claw. The first, second, and third 

 pairs are rather short, and have the last articulation spherical. 

 The fourth pair are large and powerful, but the fifth are much 

 more slender. The extremities are apparently unfitted for lo- 

 comotion, and are therefore generally bent in upon the abdo- 

 minal surface of the body, except the last pair, which appear 

 to be constantly moving about. 



The four middle segments of the body have their external 

 edges inflected beneath the body to within a little of the mesial 

 line. The posterior edges of those inflections are strongly pec- 



