SCALARIA GROENLANDICA Cliemn 

 PI. III. Fig. 16. Length 25 mm. 



The animal is white and somewhat translucent, mottled with 

 opaque white. The foot is long, rounded behind and broad and 

 truncate in front. Jeffreys says of the English species, S. dathraius, 

 "the body is clear white and thickly interspersed with opaque white 

 flakes, foot often carried considerably in advance of the head and 

 tentacles." resembling in these respects S. groenlandica. The oper- 

 culum of the English species is described as white by Clark while 

 Jeffreys says it is yellowish brown. In the other English species of 

 Scalaria the operculum is described in two of them as dark horn color, 

 in another species light horn color. In our species the operculum is 

 quite black forming a striking contrast to the white shell and white 

 soft parts. Mr. Blaney says that a deep purple fluid is secreted 

 by the animal on its removal from the shell. 



The early stage of this species shows for nearly four whorls a 

 smooth shell resembling a full grown Rissoa minuta, then abruptly 

 begins a series of costae so characteristic of Scalaria. (PI. VIII. Fig. 

 16 A). 



TURRITELLA EROSA Couthouy 

 PI. IIL Fig. 17. Length 20mm. 



The foot is white, the proboscis lemon-yellow, the end is deeply 

 cleft and each lobe moves alternately as in Aporrhais. The crawling 

 disk appeared nearly circular in outline about the size of the aperture 

 of the shell, deeply wrinkled with the anterior portion widely rounded 

 and shouldered at sides. I did not see it fully expanded. The creature 

 was very sensitive, it protruded with extreme caution. The ten- 

 tacles were rather short and delicate, the eyes on slight prominences. 



Jeffreys regards the English representative of this species as 

 Turritella polaris of Beck. Forbes and Hanley describe the foot 

 as very short in proportion to the body, truncate in front, rounded 

 behind. Forbes and Hanley figures the animal of T. ierebra in an 

 expanded condition. In England T. erosa is found fossil in the glacial 

 deposits. 



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