TETHYS-WEST AMERICAN. 87 



A. lessonii RANG. Hist. Nat. Aplys., p. 60, pi. 14. LESSON, 

 Voy. autour du Monde, etc., La Coquille, Zool., ii, pt. 1, p. 295 

 (1830). 



T. INCA d'Orbigny . PI. 1 9, figs. 29, 30, 3 1 . 



Extended animal as much as 20 cm. long. Moderately length- 

 ened, elevated, flabby, very ventricose. Cephalic portion elongated, 

 on a very short neck ; buccal lobes very long and very wide, flat- 

 tened and inrolled at the end, which is thin, sharp and strongly 

 ridged. Tentacles long, subconic, obtuse and slit at the ends, placed 

 slightly behind the middle of the interval between buccal and swim- 

 ming lobes. Eyes visible, in front of the tentacles. Mouth placed 

 at the lower part of the fissure separating the buccal lobes. Foot 

 narrow, strongly wrinkled, acuminate behind. Swimming lobes 

 very large, united and much prolonged behind the gill. Mantle 

 swollen, oblong, smooth, with a very small round aperture in the 

 middle ; posteriorly it is produced in a very long, wide and thin 

 tongue. 



Color, a beautiful violet tint, with rounded white spots on the 

 sides of the front part of swimming lobes, and several larger, more 

 regular oblong and spaced on the neck and head, usually two be- 

 hind the tentacles and four in front on each side, on a line with the 

 forward insertion of the swimming lobes. Swimming lobes marked 

 along the inside edge with a narrow border of clear rose-violet, 

 flanked by large rounded and angular white blotches on a purple- 

 brown ground. Mantle uniform violet. Gill purple violet. Pre- 

 served in alcohol this species retains the entire pattern of spots, 

 but the ground tint becomes blackish, dotted with blackish. 



Shell amber colored with corneous edge. 



Callao Bay. 



Aplysia inca ORB., Voy. dans PAmer. Merid., p. 207, pi. 14, f. 13. 

 A. incus SOWB., Conch. Icon., f. 28. 



This species differs from T. lessoni in pattern of coloring, and the 

 non-tubular mantle foramen. 



T. CHIERCHIANA Mazzarelli & Zuccardi. 



This new species is based upon two specimens from the island of 

 San Lorenzo, Peru. The principal character of the species consists 

 in the presence of a contractile, strongly-developed papilla in the 

 center of the mantle, at the point where there is ordinarily an aper- 

 ture. This papilla is swollen at base, narrowed toward the sum- 



