HOYLE: KEPORTS OX THE CEPHALOrODA. 41 



by two pairs of smaller suckers, and then by a large number of gradually di- 

 minishing suckers in four series. Besides the two large proximal suckers are 

 two rounded pads, situated in hollows, so placed that they occupy two angles 

 of a rhombus, the suckers occupying the other two. With the suckers they 

 undoubtedly constitute a fixing apparatus, as suggested by Fischer. 



The Surface is smooth throughout. 



The Color, in the spirit specimen, is a pinkish yellow, rather darker above ; 

 the buccal membrane a dull yellowish purple, paler within than without. 



The Radula (Plate 7, Fig. 7) is remarkable for the complexity of the central 

 tooth, which consists of a triangular cusp, springing from a rather irregular 

 base; on either side of the base, near its posterior end, there is a prominence, 

 which sometimes forms a separate denticle, united by a distinct articulation 

 with the body of the tooth ; this is seen on the left-hand side of the portion 

 drawn. The first laterals are stout and simple, an acute point springing grad- 

 ually from a somewhat rectangular base. The second and tldrd laterals are 

 very much alike, sickle-shaped, bent almost to a quadrant, and rather blunter 

 than the others: the outer series are comparatively more slender than the 

 inner. 



Dimc7isions. 



. mm. 



Length, total (excluding tentacle) 33 



End of body to mantle-margin 19 



Breadth of body 6 



Lengtli of fin 9 



Breadth of fin 13 



Length of first arm 8 



Lengtli of second arm 7 



Length of third arm 7 



Length of fourth arm 9 



Length of tentacle 18 



On opening the mantle-cavity there are seen just behind the base of the 

 funnel two acorn-shaped bodies, one on either side of the middle line, the rec- 

 tum passing forwards between them. Farther back in the middle line is a 

 spheivjidal body, veiy much like an eye in general appearance; still farther 

 back in the middle line is a fourth, and at the root of each gill is another 

 larger one; these are phosphorescent organs, and an account of their structure 

 will be found in the Appendix (p. 51). 



Professor Pfeffer has included in the genus Ptcryrfioteuthis Riippell's species 

 hitherto known as Enoploteufhis margarit-ifera. This view I adopted in a 

 communication (:02) dealing with the luminous organs of the latter speciis, 

 but further consideration has led me to the conclusion that the differences 

 between them are too groat to allow of such a course. They agree in form ami 

 general appearance, in the size and deep color of the buccal membrane, in the 

 tips of the arms being devoid of either hooks or suckers, and very strikingly 



