MARSHALL: ADDITIONS TO BRITISH CONCHOLOGY. 189 



brown, the ruby tint vanishing in dead specimens and leaving them 

 of various shades of brown. Sowerby's figure in respect of colour 

 just hits these specimens. I also have this dark-coloured form from 

 several parts of the Mediterranean, under the name of C.scalaris Monts. 

 Although a more variable shell than even C. tubetrula7'is, C. bai-leei 

 seems to have no forms quite corresponding to the var. tiana or var. 

 clarkii of the former ; but there is a dwarf form not much larger than 

 var. 7ia}ia, and the var. clarkii is nearly represented by the var. 

 i?iterrupta, to be mentioned presently. Usually the rows of tubercles 

 in both species are longitudinally straight, but in a few cases they 

 are disposed diagonally, as in C. diadema Wats. A conical form 

 from Scilly is white, with aberrant tubercles, and is strikingly like 

 Cerithium me hi la. 



var. SCalaris Marsh., Joiirti. of Conch., 1893, vol. vii., p. 259 (by 

 error as C. tubercularis var. scalaris) belongs to this species and not 

 to the last, as indicated by the absence of the keeled base. It is a 

 very distinct form, and immature specimens especially are strikingly 

 different from the same stage of the type. The whorls are flattened 

 and turreted as in Odosioviia scalaris, the embryonic ones are not so 

 suddenly pinched up, and the rows of tubercles are more equalised. 

 It is found only in the Scillies, where it must have a different habitat 

 from the type, as all the specimens are more or less encrusted with a 

 species of nullipore. There are several forms of this variety ; one is 

 exceedingly slender and needle-shaped, which, with a sinn'lar form of 

 the type, corresponds to C. iuberculaiis var. acicula. In these three 

 attenuated forms the nodules are smaller and crowded together, and 

 the shells are almost "of the same width throughout. 



var. interrupta Marsh., n.var. — Having but two rows of tubercles 

 on the four upper whorls, and three rows as usual on the four lower. 

 One specimen from Guernsey, and half-a-score from the Scillies. 



Searles Wood, in his third volume of "Crag MoUusca " (p. 52), 

 writing of C. tubercularis, says : '' C. barleei I do not know." But in 

 his Addendum (p. 181) he adds : " Jeffreys sent me his British recent 

 specimens from which he formed two distinct species, C. barleei and 

 C. pulchella. It does not appear to me that these shells present 

 sufficient differences from tubercularis to entitle them to specific 

 isolation, but they have their exact representatives among the Crag 

 specimens. Under these circumstances I have still retained them 

 under the specific name tuberculajis. My var. subulata represents 

 C. barleei, and my var. nana, C. pulchella.'''' Subsequent authors have 

 disregarded this identification of C. barleei, perhaps because Searles 

 Wood himself repudiated the specific distinctness of the recent shell 

 from the Crag one, or perhaps because his figure of var. subulata is 



