PROF. "W. A. HASWELL ON AUSTEALASIAN POLYCLADS. 475 



stones in Lyttleton Harbour. But in this the numerous minute eyes over the brain- 

 region are (imperfectly) divided into two by a narrow space, and though tliey extend 

 forwards nearly to tlie anterior margin, it is only as a relatively narrow band. Moreover, 

 the marginal eves onlv extend over less than a half of tlie margin. The female 

 aperture leads vertically upwards to the ootype, Avhich runs forwards a short distance 

 and narrows as it bends backwards. Into tlie dorsal limb on the ventral aspect the 

 uterine ducts open at a point nearly directly over the female aperture. Posteriorly 

 the vagina is produced and terminates in a large and comjilicated rcceptaculum seminis. 

 The male apparatus was not distinguishable in the entire mounted specimen, and 

 sections are not available at present. 



EcHiNOPLANA CELERRiMA, n. g., n. sp. (Plate 36. figs. 6 & 7 ; Plate 37. figs. 1-3.) 



This is a rather small Polyclad, averaging about 1'5 cm. in length and 6 mm. in 

 breadth at the broadest part (towards the anterior end). The colour varies somewhat 

 and is never very pronounced. Usually the dorsal surface has a reddish-brown tint. 

 'J'here are no tentacles. The eyes (Plate 37. tig. 1) are arranged in two somewhat 

 elongated groups, one on either side of the brain, each including about thirty. The 

 brain and the eves are in the first fifth of the length of the bodv. The mouth is 

 distinctly behind the middle. The male aperture is about halfway between that and 

 tlie posterior end — at about the junction of the tliird fourth with the last. The female 

 aperture is a considerable distance behind the male, nearer the posterior end than to 

 the latter. In front of it is a peculiar, transversely corrugated area of the integument. 

 In front of the male aperture in the living specimen the peuis is usually plainly 

 recognizable as a narrow elongated brown object. 



The pharynx has twelve to tifteen pairs of lateral folds, and the number of pairs of 

 intestinal caeca is about the same. The main intestine extends some distance iu front 

 of the anterior extremity of the pliarynx. 



The lateral vasa deferentia (PI. 37. fig. 2) open into an elongated median vesicala 

 seminalis, which terminates in front in a very fine duct (duct of vesicula). This 

 traverses from before backwards a conical papilla projecting backwards into the lumen 

 of the granule reservoir from its anterior extremity and opens into the latter. 



Tiie gi'anule reservoir is of great length : it has tlie form of a tube with muscular 

 walls, wider at its proximal or anterior end than at its distal or posterior, with three 

 sharp bends in its course. In its posterior part it presents about half a dozen slight 

 regular constrictions. Its mviscular layers are of considerable thickness and its 

 epithelium is thrown into a series of longitudinal folds. 



The ejaculatory duct, narrow and coiled where it leaves the granule reservoir, widens 

 posteriorly as it traverses the penis. The anterior narrow part has a very definite 

 cylindrical epithelium surrounded by a condensed layer of the muscular fibres of the 

 penis; many granule-gland ducts traverse the muscular l.iyers and perforate the cells 

 of the epithelium to open into the lumen. Posteriorly the duct soon loses its epithelium 

 and becomes beset with the horny teeth described below. 



The penis consists of an enormously thick mass of muscular fibres occupying 

 the greater part of the vertical diameter of the body and about a tenth part of the 



Ga* 



