1894. PROCEEmKGS OF THE NATIONAL MUSEUM. 503 



Diagnosis. — Stomatopodaliaving the sixth abdominal segments sepa- 

 rated from the telson by a movable joint; the hind body depressed, 

 loosely articulated, and wide; the dactylus of the raptorial claw with- 

 out a basal enhirgement, but with not less tlian five marginal teeth; no 

 more than four denticles, and often only one, between the intermediate 

 and submedian marginal spines of the telson, which is usually wider 

 than long; and the outer spines of the basal prolongation of the uropod 

 usually longer than the inner one. 



Remarls. — Although tlie name Goronis antedates Lysiosqiiilla, the 

 latter is the proper name for this genus, because the former was used 

 first by Iliibner in 1810 for a genus of Li'phJoptcra. The species of 

 Lysiosqiiilla may be separated into two subgroups; one, corresponding 

 to Latreille's genus Goronis, includes those in division A and B a of the 

 following key. Tliey all have small eyes and broad appendages to the 

 Wii Iking legs. The three species in B ^(, however, have characters which 

 place them in an intei'mediate position between A and B &, the latter 

 division corresponding to Dana's genus LijsiosquiUa proper, which is 

 characterize<l by the possession of large triangular eyes a*nd linear 

 appendages to the walking legs. Brooks has pointed out the relation- 

 ship between Goronis and the lower forms of Squilla. 



ANALYTICAL KEY TO THE Sl'ECTHS OK LYSIOSQUILLA. 



A. Telsou witli a transverse row of dorsal spines in addition to the marginal ones, 



oyi's ;is a rule cylindrical. 

 a. Uactylus of the raptorial limb with 6 or 7 teeth. 



* Five dorsal spines on the telson. 



Telson with about 12 minute si;braedian denticles; rostrum quadrate 

 with lateral angles right angles; dactylus with 6 teeth. 



ACANTHOCARPrs (Gray) Miers. 

 The same, bnt dactylus with 7 teeth. 



ACANTHOCARPTis var. SRPTEMspiNOSA, Miers. 

 Telsou with 12 minute submedian denticles; lateral angles of rostnim 

 rounded; dactylus witli 6 teeth ; transverse markings without eye- 

 spots SARAciNOurM, F. Miiller. 



Telson with 6 to 8 submedian denticles ; not minute, transverse markings, 

 with eye-spots on carapace and telson; dactylus with (? teeth. 



BiMiNiENSis, Bigelaw. 



* * Seven dorsal spines on the telson. 



Dactylus with 6 teeth hraziehi, Miers. 



Dactylus with 7 teeth latifrons, de Haan. 



h. Dactylus with 10 or 12 teeth. 



Telsou with 3 dorsal spines spinosa, Wood-Mason. 



Telson with 8 scarcely discernible dorsal spines eusebia, Risso. 



[Note. — Squilla indefevsa, Kirk (1879), and Squilla tridentata, Thomson (1882)^ 

 are probably Lysiosquillae belonging in this section (Cf. Miers, 1880, p. 125), 

 while Squilla Imvis, Hutton (1879), appears to belong in this section or the next.] 



B. Telson without dorsal spines. 



0. Eyes small. 



* Dactylus with 10 teeth. Eyes small, with cornea oblique and somewhat 



flattened; telson with (> marginal spines, the submedian mobile, and 

 on each side 7 to 9 minute submedian denticles, 4 intermediate and 1 

 lateral ar.mata, Smith. 



