102 
beginning of the second third of the post-pharyngeal body-section 
(text-fig. 3). 
The male organ (text-fig. 4) shows a large oval vesicula granul- 
orum with thick muscularis traversed by very numerous and broad 
gatherings of exits for the extra-capsular prostatic giands. (Plate 
IV, Fig. 30). The inner lining of the vesicula is richly folded, thus 
forming a large number of radial chambers arranged very regularly. 
In a sagittal section of the prostatic vesicle, 15 to 20 such chambers 
can be observed at the same time (Plate II, Fig. 30, prc). In a 
strict sense the epithelium does not as usual contain giand cell 
bodies, as these are embedded in a thick layer between it and the 
muscularis. On account of the stoutness of the layer of intracapsular 
giand cells, the lumen of the vesicula is reduced to a canal-system. 
The extremely musculated vesicula seminalis belongs to the 
Djiboutiensis-type, and is thus three-lobed, lying partly under, but 
to its greater part anterior to the prostatic vesicle (text-fig. 4). The 
medial prong of the seminal vesicle is not so stout as the lateral 
prongs, and soon assumes the character of a sinuous ductus ejacul- 
atorius (de). Halfway in the fleshy conical penis this unites with 
the efferent duet of the vesicula granulorum, thus establishing a 
feature similar to the penis of 5. orientalis. The antrum has a 
development similar to that of S. orientalis. 
In its inner anatomy the new species agrees best with 5. orien¬ 
talis Bock. In exterior appearance, distribution of eyes, its more 
feebly developed muscle wall of body, the larger interspace between 
pharynx and male apparatus, etc., the species shows pronounced 
differences from orientalis and its variety splendida. 
Ilyplana aberrans n. g. n. sp. 
(Plate IV, Fig. 22). 
Lo ca li ty: New Zealand, Colville Channel. 35 fathoms. Sand 
and mud. 
Material: One specimen collected July 21, 1914. 
Habitus: The shape of the animal is more nearly elongated oval, 
with the lateral lines converging slightly more in the caudal than 
in the anterior part. The body is thin, O.s mm, and delicate and 
shows on the whole more similarity to the Leptoplanid-hBbxXViS than 
to the usual 5^y/oc/iiti-appearance. On account of the great curving 
