1892.] NATURAL SCIENCES OF PHILADELPHIA. 213 



ON THE ANATOMY OF SAGDA, CYSTICOPSIS, ^GISTA AND 



DENTELLARIA. 



BY HENRY A. PILSBRY. 



Sagda (Hyalosagda) similis C. B. Adams. (PI. XIII, figs. A. B. C. D. E.) 



The specimens were collected by Mr. C. W. Johnson at Port 

 Antonio, Jamaica, in April, 1891. They were killed by drowning. 



The foot is very long and narrow, measuring length 20, breadth 

 in the middle, 3 mm. The sides of the sole are subparallel. The 

 sole (PI. XIII, fig. E, s.) has a central longitudinal sulcus, but is not 

 tripartite. Above, the foot is granulated. 



The jaw (PI. XIII, fig. D.) is delicate, thin and arcuate, having 

 no median projection. It resembles somewhat the jaw of Microphysa 

 and Bulhnulus, seeming to be composed of twenty-seven narrow 

 vertical plates, soldered together, but slightly overlapping on their 

 outer edges. This shingle-like imbrication is not, however, as 

 marked as in Bulimulus. The teeth resemble those of Sagda 

 haldemaniana as figured by W. G. Binney, but they are shorter. 



The genital system (PI. XIII, figs. A. B. C.) is elongated. The 

 female organs (fig. C.) lack dart sac or other accessory glands. The 

 oviduct of the several specimens examined, contained from four to 

 six ova, of a short-oval form, measuring 2*4 x 1*8 mm. The egg 

 shell is hard, brittle and calcareous. The albumen gland (a, gl.) is 

 narrow. The duct of the spermatheca (sp.) is very long, and is 

 swollen at its origin. The male organs (figs. A. B.) are peculiar. 

 The penis sac (p.) is long, and at its apex are inserted the vas 

 deferens (v. d.), the retractor muscle (r. p.) and a long folded 

 flagellum (fl.). From the middle of the penis sac springs a curiously 

 complicated accessory diverticulum (figs. A, B., 2, o.). This organ 

 is at first of equal size with the penis itself, but it then becomes very 

 narrow; it again widens into a long, convoluted blind sac. In fig. 

 A, this organ is seen in its natural position as it lies folded Avithin 

 the body-cavity. In fig. B. the organ is seen uncoiled to show its 

 form and length, I do not know that any similar structure has been 

 observed hitherto. The retractor muscle of the penis seemed to be 

 attached to the vaginal sac, instead of to the body-wall. This may 

 possibly be a mistake, however. 



