180 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



as consisting of four whorls, sharp and narrow, the three lower ones 

 scored ' with the characteristic markings of Clathurella, and the 

 extreme tip indistinctly and closely dotted with tubercles somewhat 

 linearly arranged.' This must have been taken from some other shell 

 than C. formosa, Jeffr., for it does not apply to that species. The 

 apical whorls of the latter are three only, broad, and brown in colour, 

 the first is smooth and button-shaped, the second conical and very 

 finely obliquely striated, and the third nearly flat-sided, obliquely 

 striated like the second, but with much coarser crinkley striae. Gwyn 

 Jeffreys' figures show this oblique striation and flattened apex, but 

 they err in depicting four whorls instead of three, and the sculpture 

 of the third should be much coarser than that of the second. I suspect 

 that when Gwyn Jetfreys described his shell he had two species before 

 him, and furllier that Mr. Boog Watson must have had one of these 

 species in his hands, because the real apex of C. formosa is exactly 

 depicted in the figure of C. cala, Watson (Challenger Gasterop., 

 pi. xxvi, fig. 1 1 ), which latter he says has the apical whorls ' scored 

 with excessively tine threadlets which are straight and longitudinal,' 

 whereas the figure differs from this description. He also says that 

 C. Calais, 'very much larger,' but the dimensions he gives of "55 in. 

 by '3 in. indicate very little difference by those of Jeffreys — 5 in. by 

 •25 in. Mr. Watson's figure of C. cala is not formosa (though the 

 apical whorls are exact), as the longitudinals of the latter are more 

 oblique and the spirals much more numerous." 



The above remarks led me to examine the " Challenger" specimens. 

 I feel convinced that the shells recorded by Mr. Watson as f '. formosa 

 are not that species ; on the other hand, C. cala seems to be close to 

 the true formosa. At present so little material has been collected that 

 it is uncertain how far variation may exist in these forms, but it may 

 well be that C. cala will prove only to be a variety. Jeffreys' 

 "Porcupine" collection contains at least four species grouped under 

 the name of formosa, and very possibly Mr. Watson saw one of these, 

 and not the true species. 



I am unable to verify the relationship of formosa and Packardi, 

 Yerrill, and have catalogued the shells under Jeffreys' specific name, 

 so that it may be clear to what form the present notes refer. 



Pleukotomella gregaria, n.sp. PI. XVI, Figs. 2, la. 



Shell somewhat thin, with a well-elevated spire, white, the proto- 

 conch stained with brown. Whorls 6, four being apical. The apical 

 whorls (worn) are reticulate, and the residue of the shell is sculptured 

 with longitudinal costse, which fade out on the lower half of the 

 whorls ; there are also numerous rounded spirals cutting the costae. 

 Below the suture there is an excavated area, showing spirals and also 

 arcuate striae, more numerous than the costae. Columella faix'ly 

 straight; mouth ovate. Long. 4*5, lat. 2mm. 



"Porcupine" Expedition, 1870, Station 17. 



A puzzling form of the group of P. subaraneosa, Dautz. & Fischer. 

 From this species it differs in sculpture, the spirals being much more 

 numerous and rounded ; from P. Watsoni, Dautz. & Fischer, it differs 



