456 THE OPISTHOBRANOHIATE 



back, as in the former specimen, were confined to a median row, 

 excepting two or three small spots to the side. 



38. ^GiRus, Loven. 



54. -^^GiRUs PtJNCTiLUCENS, D'OrUgny. 



A single specimen of this Nudibranch was taken near the Duke 

 Rock on September 26th of this year. 



DESCRIPTION OF PLATES XXVII and XXVIII, 



Illustrating Mr. W. Garstang's '' Complete List of the Opistho- 

 branchiate Mollusca found at Plymouth, with further Observa- 

 tions on their Morphology, Colours, and Natural History.^' 



PLATE XXVIL 



Fig, l.—Goniodoris castanea, A. and H. A young individual, enlarged, possessing oral 

 tentacles of simple, semi-crescentic form. 



Fia. 2.— Goniodoris castanea, A. and H. Head-region of a full-grown individual, 

 enlarged, showing the double sinuous curve of the anterior edge of the oral tentacles. 

 After Alder and Hancock. 



YiQ. 3. — Ooniodoris castanea, A. and H. A coil of spawn of unusual form. Nat. size. 



YiQc. 4. Goniodoris nodosa, Mont. A young individual, enlarged. The pleuropodial 



folds are freely scalloped, but, as in G. castanea (fig. 1), are discontinuous posteriorly. 

 Between the anus and the posterior termination of these folds is an oval unpigmented spot, 

 represented rather too conspicuously in the figure. 



Fig. 5. Goniodoris nodosa, Mont. a. Two transverse rows of the radula of a full- 

 grown individual, magnified. Zeiss, obj. A, eye-piece No. 2, cam. luc. The denticulations 

 of the inner side-plates ought to be about 24 in number. ^. The external side-plates of a 

 young individual, ^V '"ch long, more highly magnified. Zeiss, obj. A, eye-piece No. 4, 

 cam. luc. The denticulations of the inner side-plates were 17 in number. In reality, the 

 dimensions of the external side-plates are only f those of a. 



FlQ.. 6. — Goniodoris nodosa, Mont. Posterior region of a large individual (i| inch long 

 X \ inch broad, preserved in spirits), enlarged, showing the complete continuity of the 

 pleuropodia behind. 



PLATE XXVIIL 



Fio. 1. — Lomanotus. A young individual, -^^ inch long, somewhat contracted, seen from 

 the right side, and enlarged. The figui'e shows the continuity between the pleuropodial 

 ridge and the postero-lateral tubercle of the sheath of the rhinophore. In this region of 

 the sheath a diverticulum of the liver is seen to exist, as well as in each of the triangular 

 papillae of the pleuropodium. The eye-spot lies under the sheath of the rhinophore; the 

 anal papilla is not represented. The two short oral tentacles of the right side are shown, 

 as well as the right anterior process of the foot. Drawn from life ; the animal, however, 

 was not very healthy. 



