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 pairs of legs are prehensile, the last four pairs 

 ambulatory. 



FlG. 136. EXOCORALLANA WARMINGII. O, MANDIBLF. X 38J. 6, OUTER LAMELLA OF FIRST MAXILLA. 



x 38|. c, MAXILLIPED. x 38}. d, TIP OF MANDIBLE, x 38J. 



Family VII. CORALLANID^. 



Mandibles becoming narrower toward the anterior part and mani- 

 festly directed inward. Apical part narrow, hidden under the cly- 

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

 mandibles not greatly produced. Movable lacinia small or vanishing; 

 molar part very often vanishing, sometimes well developed. Apex of 

 second maxillae 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 GENERA OF THE FAMILY CORALLANID^. 



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



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

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

 Molar part of mandibles wanting. Second maxillae simple; lacinise not dis- 

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



b / . First maxillae with the apex of the third article furnished with three spines. 

 Molar part of mandibles well developed. Second maxillae indistinctly 

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



Genus Tridentella, new genus 



a'. First maxillae with the apex of the 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 papillae and covering tip of first article. 

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

 conical ; terminal joint slender and conical Genus Nalicora Moore 



See Hansen for characters of family. Vidensk. Selsk. Skr. (6), V, 1890, pp. 

 312-313, 317, 390, and Stebbing, Fauna and Geography of the Maldive and Laccadive 

 Archipelagoes, II, Pt. 3, 1904, p. 703. 



