On the Terrestrial Mollusca of Dominica. 429 



Elai^s Jiliformis ( Gthr. ) . 

 An adult example from Bogota differs from the typical spe- 

 cimen in having two postociilars. Ventral shields 295. 



Atractasjpis rostrata. PI. XTX. figs. I. 



Head broad, depressed ; snout slightly turned upwards, the 

 rostral shield being provided with a sharp anterior edge, and 

 extending backwards for some distance between the anterior 

 frontals ; two pairs of frontals. Vertical extremely broad ; 

 one pr«- and one postocular ; five upper labial shields, the 

 third and fourth entering the orbit; temporals 1 + 1, the ante- 

 rior descending between the fourth and fifth labials : a very 

 long lower labial shield corresponds to the third, fourth, and 

 fifth upper labials. Scales in twenty -three rows. Body elon- 

 gate. Ventrals 227-244 ; subcaudals simple, 22 or 23. 



Two specimens, 22 inches long, were sent by Dr. Kirk from 

 Zanzibar. This is the fifth species of this genus in the Col- 

 lection of the British Museum. 



XLIX. — On the Terrestrial Mollusca of Dominica and Gre- 

 nada; iriith an Account of some neio Bpecies from Trinidad. 

 By R. J. Lechmere Guppy, F.L.S., F.G.S., &e. 



Part I. DOMINICA. 



Dominica is, I believe, the only island in the Antilles of 

 which no list of terrestrial Mollusca has yet been published. 

 In Mr. Bland's Catalogue, in the ' Annals of the New York 

 Lyceum,' still the most complete list we possess of the land- 

 shells of the West Indies, it is stated that no species from 

 Dominica were known to the author. To remedy this defect, 

 I took advantage of a vacation to visit and explore that island, 

 which I found to consist chiefly of mountains composed of 

 volcanic rocks, and ranging from 2000 to 5000 feet high. 

 This is perhaps the highest land in the chain of the West- 

 Indian Islands between Jamaica and South America. 



There is but little which may be properly called loAvlands 

 in Dominica ; but on the lower slopes near the sea I found a 

 few Mollusca, chiefly Bidimulus exilis, Steriogyra octona^ 

 Succinea approximans^ and Helicina humilis. Ascending 

 higher, we find Helix dentiens, H. hadia, H. Josephince, H. 

 niqrescens, Amphihulima patula, Bulinudus laticinctusj and 

 Helicina epistilia. Excepting the last one, these species are 

 found everywhere above 300 or 400 feet of elevation. The 

 dense and excessively humid forests which cover all the higher 



