267 



Cephalopoda. 



267 



Dimensions of Specimen H 1357. 



Length, total 



End of body to mantle margin 



End of body to eye 



Breadth of body (without lins) 



Breadth of head 



Eye to edge of umbrella 



Length of iirst arm 

 Length of second arm 

 Length of third arm 



Right 



55 

 5i 

 59 



mm 

 190 



115 



123 



72 



53 

 50 



Left 

 54 

 56 

 65 



Breadth of fin 



Diameter of largest sucker on sessile arm 



Diameter of largest sucker on tentacle 



Length of Shell 



Breadth of Shell 



Length of fourth arm 

 Length of tentacle 



Right 



5i 

 109 



mm 

 13 



2,5 



7,5 

 i°3 

 49 



Left 



55 



130 



no 



That these specimens belong to the same species as S. papillatu Q. and G., admits, I think, of 

 doubt. That this is a synonym of S. tulerculata Lamarck is made quite clear by d'Orbigny's identi- 

 fication, he having had the types of both species for comparison. This is confirmed by the fact that 

 Lamarck figures the two elliptical patches above described. His representation of the tentacular suckers 

 must be regarded as merely conventional, but it is remarkable that he should not have noticed and recorded 

 the arrangement of the suckers in the club. d'Orbigny's Statement "C'est ä tort que les tubercules ont ete 

 representes comme coniques" (p. 274), shows that the drawing was not quite accurate. The present examples 

 seem to be lighter in colour than the types, they could scarcely be described as "violet fonce" above. 

 What Leach's S. mamillata was, if not this species, it is impossible to say; in any case it is only a manuscript 

 name and the drawing is obviously inaccurate. 



I am rather at a loss to determine the exact relation between these specimens and the two referred 

 (through with some doubt) by Steenstrup (loc. cit.) to the same species. This author describes the suckers in his 

 examples as being in eight rows at the distal extremities of the arms. This is certainly not the case in 

 those submitted to me. It is noteworthy also that the spermatophores in Steenstrup's specimen are attached 

 to the outer side of the buccal membrane whilst in one of the examples, here described, they are affixed 

 to the outer lip inside the buccal membrane. 



Microscopic Structure. 



The histological details are very inadequately preserved, but still in view of the rarity of the species 

 I have thought it best to give a brief account of the minute structure of the modifications of the epidermis. 



The dorsal Papulae (PI. Va, Figs. 10, u). 



The centre of each primary papilla consists of a mass of muscular fibres, running in all directions 



(Fig. 10). Into each secondary papilla this muscular basis is prolonged (m), the central portion consisting 



of transverse fibres, crossing each other at various angles. Down the sides of the secondary papilla run 



longitudinal fibres {m l.), parallel with its axis. They do not appear to form a continuous coat but to take 



the shape of isolated bundles. The Spaces between the secondary papillae are filled with connective 



tissue, in which large chromatophores occur here and there (ch). The epithelium is columnar (Fig. II ep.) 



and consists for the most part of very slender cells with sausage-shaped nuclei ; a number of smaller cells 



with rounded nuclei lie between the bases of the longer cells. Below the epithelium the connective tissue 



is divided into compartments by the radial muscular Strands, which pass out to the basal membrane; many 



of these interspaces contain large masses of granulär material, sometimes with nuclei (Fig. 11 g), which are 



apparently disintegrated cells. 



34* 

 34* 



