ACADEMY OF SCIENCES. 41 



The Secretary read a communication from the President, giving 

 data concerning the solar eclipse of March 25th, 1876. 



W. N. Lockington presented a second paper "On the Crus- 

 tacea of California," containing a description of seventeen new 

 species. 



Description of Seventeen New Species of Crustacea. 



BY W. N. LOCKINGTON. 



Platypes, nov. gen. 



Rostrum simple, post and pre-orbital spines wanting, hinder feet laminate. 



Platypes edenlata. nov. sp. 



Rostrum laminate, triangular, simple; carapace tuberculate, the tubercles 

 not prominent, and each covered with smaller tubercles. 



Form of carapace broad, pyriform; antero-lateral margin not well defined, 

 indistinctly lobed; postero-lateral and posterior margins forming a continuous 

 curve, without spines or projections. Eyes not projecting, rostrum and an- 

 tero-lateral margin forming a continuous line. 



Propodus of first pair smooth, obloug; fixed finger and dactylos closing only 

 at the tips, which are somewhat spoon-shaped, manus with an alveolate up- 

 per edge. Hinder four pairs broadly laminate. 



Length of largest specimen, a female, 0.44, greatest width, 0.38. 



Three specimens of this small and curious species from Mazatlan, presented 

 by Hy. Edwards. Not having seen anything similar, or met with any generic 

 description which seems to apply in every respect, 1 propose to make it the 

 type of a new genus. 



Atergatis cristatissimo . 



Carapace transverse, elliptic, the front and antero-lateral border forming 

 the greater portion of an ellipse, the front not projecting beyond the line of 

 the ellipse. Antero-lateral margin cristate, the crest divided by short sulci 

 into four lobes, of which the 2d is short, the 1st and 3d long, and the 4th 

 turns somewhat abruptly inwards, the crest ending half way along the postero- 

 lateral border, which is short and only slightly concave. Front slightly 

 waved. Areolation distinct upon the central and antero-lateral regions, but 

 becoming obsolete posteriorly. 



Chelipeds about equal in size, manus with three distinct low beaded ridges 

 on the outer side, and a sharp crista above, the latter continued along the 

 carpus. Fixed finger short, with a long sharp tooth on its inner face. Dac- 

 tylos cristate above, inserted some distance below the upper margin of the 

 manus. The fingers are pointed at the ends, and knife-like on their inner 

 edges. Hinder limbs cristate, compressed, claws long and sharp. Color 



