107 

 THALAMITA INTEGEA, Dana. 



Thnlamita integra, Dana, U. S. Expl. Esped. Crust., i, 281, pi. xvii, f. 6. — Alph. M. 

 Edwards, Arch, du Mus., x. 3.56.— Stimpsox, Proc. Acad. Nat. Sci. Phila. 

 1858, 39. 



Locality : Hawaiian Islands. 



The resemblance between the two preceding species of Thalamita is 

 7ery close, and at first sight they may be very readily confounded; yet 

 rheir differences are well marked and constant. In collecting them, the 

 two kinds were thrown together as belonging to the same species; but 

 when their specific characters were once recognized, there was no diffi- 

 culty in separating the one from the other. The integra is much more 

 abundant in the harbor of Honolulu, than the admete. In a lot of twenty- 

 seven, collected from that locality, there were twenty-two of the former 

 aud five of the latter. 



The following are the chief points of difference between the two spe- 

 cies. In integra there are two spines on the superior edge of the hand ; 

 one, sharp-pointed, is situated on the middle of the border, aud its base 

 is continuous with an abrupt ridge running to the base of the hand; 

 the second spine, usually blunt and eroded in the adult, but sharp- 

 pointed in the young, is placed on the extreme distal angle of the upper 

 border, and is also continuous by its base with another abrupt ridge, 

 which extends toward the middle of the hand, but which is interrupted 

 at the base of the first spine. The position of this second spine is o, 

 point of great diagnostic importance. Exterior to the superior edge is 

 another spine, more or less worn down, the base of which coalesces 

 "With a rounded ridge, running toward the base of the hand ; in front of 

 and a little superior to the last, at the angle, is a slight prominence; 

 there is a fourth spine at the base of the hand near the carpal articula- 

 tion. The surface of the hand is smooth. 



In admete there are likewise two spines on the superior border of the 

 hand ; but their arrangement is somewhat different. The outer one is 

 not placed on the extreme distal angle of the hand, but is posterior to 

 it; and the ridge which extends to the base of the hand, from the spine 

 on the middle of the border, is serrated. The other si)ines on the hands 

 have exactly the same arrangement as in integra. The superior surface 

 of the hand is sparsely and coarsely granular; the inferior border finely 

 granular. 



The carapace furnishes some additional characters. In integra the 



