474 A. JE. Verrill — Marine Planarians of J^etc England. 



conld be seen indistinctly when it was compressed under the micro- 

 scope. There are apparently two small genital pores, near together, 

 but distinct, as in E. ellipticus, with which this species seems to agree 

 nearly in the structure of its reproductive organs. The convo- 

 luted vas deferens, which runs up, on each side, to about opposite 

 the middle of the stomach, discharges into the lateral lobes of a 

 relatively large, three-lobed, or somewhat anchor-shaped, seminal 

 vesicle, which is more conspicuous than most of the other organs ; 

 its three lobes point backward, while its anterior end is broadly 

 rounded ; its middle lobe is longer than the others, and connects 

 with a narrow efferent duct. The male copulatory organ is broad- 

 elliptical, terminating in a conical penis-sheath and a small, short, 

 straight, tapered penis, which terminates close to a small external 

 pore. The larger or elliptical part of the male organ may be, at 

 least in part, a "granular gland," but I was unable to clearly dis- 

 tinguish between the penis-bulb and the glandular organ. The 

 female organs consist of two evident parts ; the more anterior por- 

 tion is a small elliptical vesicle (copulatory pouch ?) ; with a posterior 

 pore ; the posterior j^ortion is a narrower and more tubular organ, 

 which appears to be a simple spermatheca. This specimen is not 

 mature sexually and the female organs are not well developed. 



I have referred this, with considerable doubt, to Girard's species, 

 for the description of the latter was very meagre, and there is con- 

 siderable difference in color. The color, however, is quite variable 

 in this group. The southern form may prove to be a very distinct 

 species. 



The generic relations of this species are somewhat doubtful. In 

 general structure, and especially in the characters of its tentacles 

 and dorsal ocelli, it agrees well with the typical species of Planocera, 

 but the latter genus is described by Lang and others as destitute of 

 marginal ocelli, which are numerous in oiir species. In the struc- 

 ture of the reproductive organs it agrees more nearly with Plano- 

 cera than with Stylochus, as described by Lang. 



In many respects the reproductive organs are like those of Eusty- 

 lochus, and it is possible that its affinities may be even greater with 

 that genus than with Planocera. But as there is but a single speci- 

 men available for the study of the reproductive organs, and that 

 seems to be immature, I am unable to determine some of the details 

 which are desirable before its position can be fully established. 



The presence or absence of marginal ocelli might be regarded as 

 not of generic importance. In that case the present species might 

 be defined as a Planocera with marainal ocelli. 



