I 
No. 10.—THE ANATOMY AND DEVELOPMENT OF THE 
TERRESTRIAL NEMERTEAN (GEONEMER TEN 
AGRICOLA) OF BERMUDA. 1 
BY WESLEY R. COE. 
Contents. 
Page. 
Page. 
Introduction .... 
531 
Ovogenesis . 
. 546 
Generic and specific diagnoses . 
533 
Spermatogenesis . 
. 549 
General anatomical peculiarities 
538 
Reproduction 
. 551 
Proboscis .... 
538 
Copulation . 
. 552 
Body walls and integument 
540 
Development 
. 554 
Cephalic glands . 
541 
Nervous system . 
. 557 
Alimentary canal 
542 
Cerebral sense organs . 
. 557 
Blood vessels 
542 
Cephalic glands . 
. 558 
Nephridia .... 
543 
Alimentary canal 
. 559 
Nervous system and sense 
Proboscis 
. 562 
organs .... 
544 
Habits .... 
. 566 
Reproductive organs . 
545 
Bibliography 
. 569 
Introduction. 
When the Challenger expedition visited the Bermuda Islands, 
in June, 1873, von Willemoes-Suhm, a member of the party, col¬ 
lected a number of nemerteans living in company with earthworms 
and other terrestrial forms on the shores of Hungry Bay. These 
nemerteans he described under the name of Tetrastemma agricola 
in a paper published in the Annals and magazine of natural history, 
for 1874 (p. 409). This paper contains a general account of the 
anatomy and habits of the worms, although a number of anatomical 
peculiarities, such as the form of the stylet basis and position of the 
mouth were incorrectly described. The specimens were lost during 
the voyage, so that Hubrecht, who worked up the Challenger mate¬ 
rial, was unable to study in detail the anatomy of the species. 
Apparently no further specimens were collected until Prof. A. E. 
Verrill and party visited the islands in 1898 and 1901, when numer- 
1 Contributions from the Bermuda biological station for research. No. 4. 
