On Young Specimens of Anthenea sp. 295 



segment, very slightly towards the pore side. It attains a 

 transverse diameter of nearly 0'4 mm., and is more or less 

 distinctly divided into two lateral portions. The yolk-gland 

 (fig. 9, vit.) lies behind it, and has a maximum diameter of 

 about 0*1 mm. Between the ovary and yolk-gland is the 

 shell-gland. 



There are from twenty to thirty testes (fig. 9, t.), arranged 

 in a single layer at the back of the segment, in the median 

 field, and not extending forward at the sides further than the 

 level of the yolk-gland. Their average longest diameter 

 (transverse) is about 0"05 mm. 



Mature segments begin to appear at about the fortieth 

 from the posterior end. There are only about eight segments 

 with fully developed organs before the appearance of extra- 

 ovarian eggs. It is doubtful whether a uterus with a definite 

 wall ever exists — if so, it only persists through one or two 

 segments. The ova seem from the first to be scattered at 

 random in the parenchyme without a definite enclosing 

 membrane. The onchospheres measure about 30 /x in 

 diameter. 



This seems to be only the second species of Oochoristiea 

 recorded from a snake. The other is 0. rostellata, Zschokke, 

 1905*, from Zamenis viridijiavus. The present form appears 

 to be more closely related to 0. rostellata than to the various 

 species from lizards, especially in the possession of a rudi- 

 mentary rostellum, in the anterior position of the openings of 

 the suckers, and in the excessively tortuous course of the 

 lateral excretory vessels. It differs considerably from it, 

 however, in dimensions and in the much smaller number of 

 testes. 



XXXV. — Note on Young Specimens of Anthenea sp. 

 By G. A. Smith. 



Included in a collection of echinoderms recently made by 

 A. Loveridge, Esq., at Dar-es-Salaam, G.E.A., are two dry 

 specimens which may be referred to the above genus. 



Recent reports on collections from the above neighbourhood 

 and from the Indian Ocean have contained descriptions of 

 young specimens of Pentaceros and Anthenea , suggesting 

 affinities with certain known species; but, on account of the 

 lack of a large and varied series of specimens and the high 



* Zeitschr. f. wiss. Zool. lxxxiii. p. 53. 



