1894. PROCEEDINGS OF THE NATIONAL MUSEUM. 509 



Gonns SQUILLA, Fabricius. 



SquiUa, Fabricius (part), Ent. Syst., ii, p. 511, 1798.— Latueille (part), Hist. 

 Nat. Crust., VI, p. 271, 1803; Encycl. Meth Hist. Nat., x, p. 467, 1825.— 

 Lamarck (part), Hist. Auim. sans Vert., v, p. 186, 1818. — Milxe-Edwards 

 (part), Hist. Nat. Crust., ii, p. 517, 1837.— de Haan (part), Fauna Japon. 

 Crust., p. 220, 1849.— Dana, Crust., U. S. Expl. Exped., xiii, i, p. 615, 1852.— 

 MiERS, Ann. and Mag. Nat. Hist. (5), v, p. 16, 1880. — Brooks, Voyage of the 

 Challemjer, xvi, ii, p. 23, 1886.— Gerstaeckei:, Broun's Klass. n. Ord. des 

 Thier., v, ii, p. 742, 1889. 



Chlorida, Eydoux aud Souleyet, Voy. de la Bonite, Zool., i, Crust., p. 264, 1841. 



Chlorldella, Miers, Ann. and Mag. Nat. Hist. (5), v, p. 13, 1880.— Gerstaecker, 

 Bronu's Klass. uud Ord. des Thier., v, ii, p. 743, 1889. 



Diagnosis. — Stomatoi)oda having the telson attached to the sixth 

 abdominal segment by a movable joint ; the hind body depressed and 

 wide; the dactylus of the raptorial claw with nsnally not more than 

 six teeth; as a rule, more than four intermediate denticles on the 

 telson, which is usually longer than wide; and the inner basal spine 

 of the uropod the longer of the two. 



Remarks. — This is by far the largest and most diversified of the 

 genera of Stomatopoda. I have followed Brooks in including withiu 

 it the old genus ChlorideUa (Eydoux and Souleyet) Miers, the chief char- 

 acteristic of which is the shape of the eyes. The species that Miers 

 referred to are contained in division B a of the following key, but no 

 sharp line can be drawn between these and those species having the 

 small eyes (e. g., *S'. dnbia), which have been placed in different divisions 

 of the genus, where many otlier characters indicate that they belong. 



ANALYTICAL KEY TO THE SPECIES OF SQUILLA. 



A. Submedian spines of the telson with movable tips. 



a. Sultmedian carinjc absent or obsolete on the first five somites of the abdomen. 



* Dactylus of the raptorial liuib with 4 teeth, including the terminal one. 

 Lateral process of the fifth thoracic somite very short aud acute ; no keel 



on the telson quadkidens, Bigelow. 



Lateral process of the fifth thoracic somite broad, curved slightly for- 

 ward, and blunt; telson with a keel polita, Bigelow. 



** Dactylus with 5 teeth. Lateral process of the fifth thoracic somite flat- 

 tened antero-posteriorly, short, straight, and blunt. 



DESMAKEsrii, Risso. 

 *** Dactylus with 10 teeth. Telson nearly smooth, with denticles 13, 18, 1. 



gkacilipes, Miers. 



b. Submedian carina- present on all abdominal somites, except the telson. 



Dactylus with 4 teeth; 5 longitudinal crests on the telson .miles, Hess. 



Dactylus with 7 to 9 teeth ; telson with crest and keel, and curved lines of 

 pits ; denticles 0, 10-11, 1 armata, Milne-Edwards. 



B. Submedian spines of the telson with immovable tips. 



o. Hind body without submedian carime except the sixth abdominal somite; 

 eyes small. 

 a'. Raptorial dactylus with 4 teeth. 



*Anterior lateral angles of the carapace rounded. rotundicauda, Miers. 

 ** Anterior lateral augles of the carapace produced into spines. 



Rostrum semioval .^iicropiithalma, Milne-Edwards. 



Rostrum emarginate latreillei, Eydoux aud Souleyet. 



