COE: TERRESTRIAL NEMERTEAN OF BERMUDA. 533 
that it is both hermaphroditic and viviparous and presents such a 
great variety of conditions in regard to the development of its 
sexual products. Willemoes-Sulim in his original account of the 
species expresses the opinion (’74, p. 410) that it is viviparous, 
although no observations were made in support of this view. 
Generic and Specific Diagnoses. 
The general anatomy of the species does not differ greatly from 
that of other Hoplonemertea and agrees very closely with the account 
given by Bohmig (’98) for Geo?iemertes chalicophora , so that a detailed 
discussion of its anatomical and histological structure is unnecessary; 
yet the species presents interesting peculiarities in regard to a num¬ 
ber of points of internal structure, and these will be briefly described. 
The external form, color, habits, and development will be treated at 
greater length. 
Geonemertes Semper. 
Zeit. f. wiss. zool., vol. 13, p. 559, 1863. 
The genus includes all known terrestrial nemerteans and may be 
characterized as follows: body long and slender, of comparatively 
small size, usually from 15 to 50 mm. in length, occasionally 150 
mm.; proboscis pore subterminal; esophagus opens into rhyncho- 
daeum either shortly in front of brain (as in G. agricola) or much 
nearer the tip of snout (as in G. chalicophora) ; proboscis sheath 
extends very nearly or quite to posterior end of body; proboscis large 
compared with size of worm, with well developed central stylet and 
basis and two or four pouches of accessory stylets, with normally 
more than 10 nerves in all forms in which the number is accurately 
known ; intestinal caeca usually extend forward nearly to brain ; 
intestinal lobes metameric and prominent; nephridia in at least two 
of the species diffused, extending from brain region far back into the 
body (in one species to posterior end of body), with numerous 
efferent ducts; cephalic glands very voluminous, extending poste¬ 
riorly behind brain ; cerebral sense organs either small, and situated 
anterior to brain, or larger, and extending beneath the brain lobes; 
eyes vary in number, being commonly 4, in some species 6, and in 
others numerous ; reproductive organs present great variations, 
