236 PATAGONIAN EXPEDITIONS: ZOOLOGY. 



4. EXOMEGAS MACROSTOMUS GALLEGENSIS (Smitt). 



t 



(Plate XXX, Figs. 4 and 4a.) 



Geotria macrostoma gallegensis Smitt, Bihang Till K. Sv. Vet. Akad. 

 Handl. Band 26, afd. iv, No. 13, 23 (Rio Gallegos and its tributaries, 

 Rio Ruben and Rio Turbio). 

 This variety is known from a single adult individual and several larvae. 

 It differs from inacrostonuts chiefly in the flat dorsal region. 



3. CARAGOLA Gray. 



<Camgo/a Gray, Proc. Zool. Soc. London, 185 1, 239, pi. iv, fig. 5; id. 

 List Spec. Fish Brit. Mus., I, 143, pi. i, fig. 5, 1851 ; Gill, Proc. U. 

 S. Nat. Mus., V, 525, 1882 Uapicida). 

 <Mordacia Gray, Proc. Zool. Soc. London, 1851, 239, pi. iv, fig. 6; id. 



List Spec. Fish Brit. Mus., I, 143, pi. i, fig. 6, 1851. 

 = Mordacia Giinther, Cat. Fishes Brit. Mus., VIII, 8, 507, 1870; Plate, 

 Zool. Jahrb. Suppl., V, 1902, 654. 

 Type :Caragola lapicida Gray. 



This genus is considered but a subgenus of Geotria by Smitt, as a dis- 

 tinct genus by Giinther, and the type of a distinct family by Gill. 



Second dorsal continuous with the caudal ; two pairs of serrated lingual 

 teeth ; maxillary dentition consisting of two triangular groups, each with 

 three conical acute cusps. 



Plate considers three species as valid which he distinguishes as follows : 



a. Outer lingual tooth a broad transverse plate with numerous points; eyes small. 



b. Wreath of inner labial teeth closed in the middle in front with three single pointed teeth. 



5 . viordax. 

 bb. Wreath of inner labial teeth closed in the middle in front with one single pointed tooth. 



6. lapicida. 

 aa. Outer lingual tooth triangular, with but two retrorse hooks. Eyes relatively large. 



7. acutidens. 



5. Caragola mordax (Richardson). 



(Plate XXX, Fig. 5.) 



Petyoniysou mordax Richardson, Voy. Erebus and Terror, Fish., pi. 38, 



1845 (Tasmania). 

 Mordacia mordax Gray, List Spec. Fish. Brit. Mus., 144, pi. i, fig. 6, 1851 



(copied) ; Giinther, Cat. Brit. Mus., VIII, 507, 1870 (Valparaiso ; Tas- 



