AMPHIBULIMA. 



Genus AMPHIBULIMA Lamarck, 1805. 



Manual, xii, p. 232. Type A. patula Brug. Amphibulia RAFIN- 



ESQUE, Binney & Tryon edit., p. 17. 



Shell Succinea-shaped; Ij apical whorls corrugated in the typical 

 forms, smooth in s. g. Pellicula. 



In Amphibulima patula christopheri , the kidney (pi. 62, fig. 27, K) 

 is longer than the pericardium, its apex covered with venous reticula- 

 tion. The ureter and secondary ureter (fig. 27, Ur.) are closed. 

 The reticulation of the lung is anterior and on the gut or intestinal 

 side, but extends further on the cardiac side than in Bulimidina. 

 The pulmonary vein seems to receive a large branch near its cardiac 

 end. The reticulation spreads over the base of the pulmonary vein 

 and the adjacent apex of the kidney. The greater part of the car- 

 diac side of the lung is plain or weakly veined, as usual in the 

 family. 



The retractor muscles are essentially Bulimuline. The pharyn- 

 geal retractor spreads but is not split distally, at its insertion on the 

 large buccal mass. At its base it is shortly united to the proximal 

 end of the left ocular and pedal band. The right ocular band arises 

 from the anterior surface of the broad columellar muscle, and retracts 

 the eye through the branches of the genitalia. The connections of 

 the muscles thus agree in all respects with Bulimulus, Placostylus, 

 etc. (pi. 62, fig. 29). 



The genital system (pi. 62, fig. 28) shows a short and very wide 

 vagina and penis, the vas deferens inserted near, the retractor mus- 

 cle at, the distal end. The duct of the spermatheca is very long and 

 slender, abruptly swollen at its base and bound to the oviduct 

 throughout. The albumen gland is small, the ovisperm duct being 

 knotted adjacent to it. The ovo-testis is a large, compact mass of 

 long, dichotomose caeca. 



The jaw is horse-shoe-shaped, thin and flexible, composed of many 

 (50-56) narrow plaits, the median ones not reaching the lower mar- 

 gin in the specimen examined by me (pi, 62, fig. 30, A. patula var. 

 christopheri). 



The radula of a St. Kitts specimen (A. patula christopheri, pi. 60, 

 figs. 11, 12) is comparatively large, composed of about 160 teeth in 

 a transverse row, the formula being 62.17.1.17.62, the 15th to 20th 

 teeth on each side being transitional from laterals to the marginal 

 type. The central row bears teeth with well expanded basal plates, 



