508 rEXIlOMYZONTIDj;. 



Petromyzon anwandteri, Philippi, Wiegm. Arch. 1863, p. 207, tab. 10. 



lig'. b (not correct). 

 acutidens, Pliilijipi, I c. 1864, p. 107, or Ann. Sf Mag. Nat. Hist. 



1865,xvi.p.221. 



Mandibulary lamina crescciit-shaped, with about nine acute conical 

 cusps, three of which are larger than the others. Suctorial teeth in 

 somewhat distant series, radiating from the centre ; the teeth of the 

 series between the mandible and the posterior lip being as numerous 

 as those of the other series, but rather more confluent. The ante- 

 rior labial teeth converge and are confluent behind ; each tooth of 

 the posterior pair is like one half of an elongate oval. Suctorial 

 disk elliptic, with a free lip behind. The first dorsal at a consider- 

 able distance from the second. Body immaculate. 



Tasmania ; Valjjaraiso. 



a. Type of Caragola hvpicida, 6| inches long. Valparaiso. 

 6. Type of Petromyzon mordax, inches long. Tasmania. From 

 the Haslar Collection. 



The example of which llichardson has given a figure, and which 

 is the type of the species, was evidently always in a bad condition. 

 At all events it had lost the horny coverings of many of the teeth, 

 and especially of the lingual teeth. The prominences on which these 

 teeth stand do not show the same outline of form, as the horny 

 coverings and many of the smaller teeth disappear entirely. Thus 

 the seeming discrepancies between Caragoht and Mordacia are to be 

 explained. That this is really the case is proved by still remaining 

 faint traces of serrature of the lingual prominences in the type 

 specimen of P. morda.v. 



According to Philippi's observations, also this species appears to 

 be sometimes provided with a gular sac. 



4. GEOTKIA. 



Geotria et Velasia, Gray, Chondropt. p. 142. 



Dorsal fins two, the posterior separate from the caudal. I\[ axil- 

 lary lamina with four sharp flat lobes ; a pair of long pointed lingual 

 teeth (like the horns of a young antelope). 



South Australia and Chile. 



1. Geotria australis. 

 Gray, I. c. pi. 2 (or Proc. Zool. Sue. 18.51 , p. 2-38). 

 Skin on the throat very lax, forming a large pouch. The maxil- 

 lary lamina is thin, crescent-shaped, Vv'ith four sharp teeth, the 

 middle pair of which arc only lialf as broad as the outer. Mandi- 

 bulary lamina very low, slightly sinuous. Suctorial teeth in nume- 

 rous series, rather distant from one another, anicuspid ; only those 

 nearest to the mouth somewhat larger, the others small. Only one 

 transverse scries of very small teeth between the mandibulary la- 

 mina and the posterior lip, which is beset witli numerous broad. 



