156 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



than the inner branch, and terminates in two acute teeth, the inner 

 one being- the larger and longer one. 



The first three ])airs of legs are prehensile, the last four pairs 

 ambulatory. 



1''IG. 136. — EXOCORALLANA WARMINGII. 0, MaMDIBLF. X 3SJ. b, OUTER LASIELLA OF FIRST MAXILLA. 



X 38|. c, Maxilliped. V 38i d, Tip of mandible, x 38i. 



Family VII. CORALLANID^.« 



Mandibles becoming narrower toward the anterior part and mani- 

 festl}^ directed inward. Apical part narrow, hidden under the cl_y- 

 peus, labrum, and paragnathia. Cutting edge short. Apical tooth of 

 nmndibles not greatly produced. Movable lacinia small or vanishing; 

 molar part ver}^ often vanishing, sometimes well developed. Apex of 

 second maxilla? simple. First maxilla? with the lacinia of the first 

 article unarmed; the lacinia of the third article becoming more or less 

 narrower from about the middle to the apex; apex furnished with few 

 spines. Antepenultimate article of the maxillipeds not longer than 

 broad. Labrum small, transverse. 



ANALYTICAL KEY TO THE (SENERA OF THE FAMILY CORALLANID^. 



a. First maxilke with the apex of the third article furnished with more than one 

 spine. Lacinia of first article narrow, elongate, with apex unarmed. 

 b. First maxillfe with the apex of the third article furnished with two spines. 

 Molar part of mandibles wanting. Second maxillie simple; laciniae not dis- 

 tinct. Clypeus long and wide, semilunar in shape Genus Alcirona Hansen 



//. First maxill;e with the apex of the third article furnished with three spines. 

 Molar part of mandiV)les well developed. Second maxillre indistinctly 

 bilobed. Clypeus short and wide, in the form of an inverted v. 



Genus Tridentella, new genus 

 (/. First maxilhc with the apex of tlie third article furnished with a single, long, 

 robust, inwardly-curved spine. Lacinia of first article in the form of a quad- 

 rate curve-faced cap furnished with papilhe and covering tip of first article. 

 Second maxillse four-jointed; first two joints stout; third joint stout and sub- 

 conical; terminal joint slender and conical Genus Nnlicora Moore 



aSee Hansen for characters of family. Vidensk. Selsk. Skr. (6), V, 1<S90, pp. 

 812-;ii;^, .'517, 890, and Stebbing, F"anna and (ieography of the Maldive and Laccadive 

 Arrliipelagoes, II, I't. o, liH)4, ]). 7(»:5. 



