194 Mr. J. C. Melvill on the 



the known species. Should further specimens be obtained a 

 more complete knowledge of the generative anatomy may- 

 throw further light on the subject. It is also desirable that 

 the form and nature of the dart should be known. 



With the above two species there is a small specimen, 

 26 millim. long, externally not unlike M. constrictus, but with 

 a more ovoid shell, and it has both the median and lateral 

 planes of the foot-sole the same colour — a bright yellow, I 

 should think — in life. The internal organs were not in a 

 very good condition, so for the present I am regarding it as 

 a small example of M. constrictus. 



1 understand that Mr. Fulton will present the three speci- 

 mens to the British Museum (South Kensington). 



EXPLANATION OF PLATE IX. 



Fig. 1. Microparmarion Fultoni, sp. n. Caudal mucous pore, a, slit-like 

 pore ; b, groove passing through the fool-fringe ; c, sides of 

 body ; d, foot-fringe ; e, lateral planes of foot-sole ; /", median 

 plane of foot-sole. The peripodial groove being inconspicuous, 

 it is not shown in this tigure. 



Fig. 2. View from the right side of the terminal portion of the body. 



Fig. 3. Generative organs. 



Fig. 4. Receptaculum seminis. 



Fig. 5. The dart. 



Fig. 6. Microparmarion constrictus, sp. n. Generative organs. 



Fig. 7. Dart-sac unfolded. 



Lctteriyig. 



alb.gl. Albumen-gland. pr. Prostate. 



d.s. Dart-sac. r.m. Retractor muscle. 



f.ov. Free oviduct. r.d. Receptacular duct. 



h.d. Hermaphrodite duct. r.s. Receptaculum seminis. 

 h.gl. Hermaphrodite gland. v. Vestibule. 



ov. Oviduct. v.d. Vas deferens. 

 p. Penis. vg. Vagina. 



XXXI. — A brief BihU'ofjrapJiical Besiane of the Erythrcean 

 Molluscan Fauna, with /descriptions of Sixteen Species 

 from Aden. By James Cosmo Melvill, M.A., F.L.S. 



[Plate XII.] 



The greater number of the marine shells dredged or other- 

 wise collected by Commander E. li. Shopland, K.I.M., mostly 

 in the immediate neighbourhood of Aden, have already been 

 catalogued by him in a paper* read before the Bombay Natural 



* Shopland, E. R., " List of Shells collected at Aden, 1892-95," Journ. 

 Bombay Soc. x. pp. 217-235. 



