18 DR. J. G. DE MAN ON THE POPOPHTHALMOTTS 



The dactylopodites are armed with a row of acute spinules 

 along their inner margins ; these spinules gradually increase in 

 length towards the tip. 



In the smaller (female) specimens the aaterior legs are com- 

 paratively smaller. 



In a, Pleione the hands of the male are a little shorter in 

 proportion to the length of the cephalothorax than in this species, 

 and they also present a somewhat less slender form . 



The hody of this Hyastenus is covered with a short pubes- 

 cence on which some longer curved hairs are distributed ; similar 

 longer hairs also occur on the spines of the rostrum and on the 

 ambulatory legs. 



Dimensions of the larger male specimen : — millim 



Length of the whole body 26| 



Length of the cephalothorax 15 



Distance between the external orbital angles .... Q\ 



Breadth of the cephalothorax 13 



Distance between the antero -internal angles of the 



supraorbital margins 4| 



Distance between the tips of the spines of the 



rostrum 7 



Length of the anterior legs 30 



Length of the hands (the fingers included) ...... 12| 



Length of the first pair of ambulatory legs 39 



Length of the last pair of ambulatory legs ...... 20 



5. HTASTENtrs Pleione, Herbst. 



Cancer Pleione, Herhst, NaturgescMcMe der Krabben und Krebse, t. iii. 

 p. 52, Taf. Iviii. fig. 5. 



Naxia Pleione, G*e?-5/«cA;e/-, Carcinologische Beitragfi, 1856, p. 114, Taf. v. 

 figs. 1 & 2. 



Hyastenus Pleione, A. Milne^JEdwards, Nouv. Arch, du Museum Hist. 

 Nat. t. viii. p. 250. 



The Collection contains four small specimens of a Syastenus, 

 which I refer to Herbst's H. Pleione, a,s they present almost 

 all the characters of this species, communicated to me by 

 Dr. Hilgendorf. These individuals were collected at Sullivan 

 Island. 



The largest specimen is only 15 millim, long (the rostral 

 spines included) ; a female, already bearing eggs, is only 10 

 millim. long, including the spines of the rostrum. The spines 

 of the rostrum are directed downward, so that they lie in 



