44 JOURNAL OK CONCHOLOGY, VOL. ID, NO. 2, At'KlL, I90I. 



PROSdBRANCHIA. 



Voluta (Cymbiola) ancilla Sol. — York Bay, Port William, after 

 easterly gales. 



Voluta (Cymbiola) becki Brod. — One fine living specimen. 

 Port William, a wild exposed bay. 



Voluta (Cymbiola) magellanica Lam. — Dead shells only. 

 ^Vhale Sound, Stanley Harbour. This locality is mentioned by Mr. 

 Vallentin as being absolutely land-locked. 



Huthria antarctica Rve. — "Common under stones at low water. 

 Spawns during January " (R.V.). 



Huthria fuscata Brug. — On shore at low water. 



Trophon cretaceus Rve. — -It is not easy to differentiate this 

 species from those examples of T. geversianus Pall., the lamellae of 

 which are more or less obsolete on the upper Avhorls. Indeed, we 

 should not feel surprised at their being ultimately united as two 

 extreme forms of one variable species. Scarce. 



Trophon geversianus Pall- — "Fairly abundant in certain places 

 in the harbour. It is known to the settlers as the 'whelk.' The 

 deposition of the curious spoon-shaped nidamental capsules was first 

 observed on the 15th December, and by the loth of the following 

 February the young fry were just beginning to hatch out. From some 

 fragmentary observations, segmentation of the ova seemed to be the 

 same as in Nassa. The ova are white in colour, and measure i mm. 

 in diameter. This species appears to live exclusively upon two 

 bivalves, Mytilus ediilis and Chione exalMda, and has been observed 

 to drill a hole through the valve of a Mytilus in two and a half hours " 

 (R.V.). A considerable number of examples are in the collection, 

 showing much variation in size, and number and disposition of the 

 fimbriate longitudinal lamellae. Some specimens nearly approach T. 

 cretaceus Rve. This species {T. geversianits) has hitherto been mostly 

 found in a dead condition, hence the fine dark umber coloration of 

 the interior of the aperture is not often seen, and this is particularly 

 noticeable in Mr. Vallentin's splendid series. Stanley Harbour, on 

 hulks and shores within tidal limits ; York Bay, Port William, 

 abundant on shore after easterly gales. 



Monoceros calcar Mart. (=J/. imbrkatus Lam.).— We refer to 

 our previous paper on the moUusca of Lively Island, Falklands, 

 (vol. 9, p. 97) for the full synonymy of this extremely variable species. 

 York Bay, Port William, found on shore after easterly gales. 



Cerithium CSelatum Couthouy MS. — Low water, spring tide. 



Crepidula dilatata Lam. — " Mostly occurs under rocks and 



