458 



rniLOMYCIDjE. 



a bulb ; ocular points on the superior part of the bulb ; tentacles 

 immediately below the cye-]>ed ancles, white, very short, nearly con- 

 ical. Mantle tleshy, covering- the whole body, its anterior edge 

 tinged with brownish, and falling in a slight curve between the two 

 eyc-i)eduncles, reaching on the sides to the margin of the foot ; pos- 



Fig 716. 



r. Carolineiisis. 



terior extremity rounded ; cuticle covered with irregular vermiform 

 glands, anastomosing with each other, and having a general ten- 

 dency to a longitudinal direction, with shallow furrows between, 

 lubricated with a watery mucus, and susceptible of contractions 

 which produce a slow, undulatory motion, like the flowing of water, 

 over the whole surface. Foot whitish, extending a little beyond the 

 mantle posteriorly, showing a whitish, flattened border. Orifice of 

 the organs of generation on the right side, at a little distance be- 

 hind and below the eye-peduncles. Respiratory orifice large, on 

 the right side, one fourth of an inch behind the origin of the eye- 

 peduncle ; anal orifice in close contact, a little above and in front 

 of it ; above the respiratory orifice, on the back, is a deep curved 

 furrow, running upwards and backwards. Locomotive band not 

 distinguished from the lower surface of the foot. (Jreatest length, 

 when fully extended, one hundred mill. ; ordinary length, seventy- 

 five millimetres. 



From Canada to Texas. 



In this species the head never projects beyond the mantle. The 

 tentacles and eye-peduncles are contractile and retractile, as in 

 the other sings. When handled it secretes from the skin a thick, 

 milky, adhesive mucus. Small individuals suspend themselves by 

 a thread. We have noticed its posterior extremity curved u})wards 

 when the animal was in motion ; at other times flattened and ex- 

 panded, and again very much corrugated, and apparently truncated ; 

 sometimes there appear to be one or more mucous glands at this 

 part, and the secretion of mucus from it is more plentiful than 

 from other parts of the body. The mantle is not cleft from the 

 respiratory foramen to the margin, as in most of the slugs, but is 



