MINUTE ANATOMY OF MEDITERRANEAN NEMERTEANS. 249 
the oral surface of the disc; spiral of buccal cilia absent; mouth 
placed in the angle formed by the junction of the body and 
disc ; body soft, changing in shape continually (?); rig with 
37 hooks, and radii; being of one piece throughout. 
Cyclocheta spongille ; on the common fresh water sponge 
(Spongilla fluviatilis). River Cherwell, Oxford. August. 
A. Animal provided with a spiral of buccal cilia. 
a. Ring not hooked; marked by a spiral line. 
1. Body ciliated— 7'richodinopsis, 1 sp. 
2. Body naked; adoral spiral of cilia terminal—Urceolaria, 1 sp. 
B. Ring hooked; adoral spiral not terminal—Zrichodina. 
B. Spiral of buccal cilia wanting; animal furnished with a row of sete 
behind dise—Cyclocheta. 
Some Remarks about the Minute ANATomY of Mept- 
TERRANEAN NEMERTEANS. By A. A. W. Hubrecht, of the 
Leyden Museum of Zoology. (With Plate XIII, figs. 6—8.) 
A stupy of some fifteen different species of Nemerteans 
from the Bay of Naples at Dr. Dohrn’s zoological station 
as well as an investigation of the scanty specimens inhabit- 
ing the Dutch coasts, have led me to results which have often 
confirmed, but which have not seldom differed from and 
contradicted the conclusions and views entertained by Mr. 
MacIntosh in his latest monographical treatises on the sub- 
ject,' in which the British species are exclusively alluded to. 
It is these points of confirmation and criticism which I 
want to put together in the following lines, although they 
have been incorporated already in the more extensive de- 
scription of my researches, published elsewhere.? In this 
brief extract I will follow the arrangement of Mr. MacIn- 
tosh’s extensive treatise—yet without describing the Enopla 
and Anopla separately as isdone there, comparing successively 
his principal observations with mine. 
My observations extended for the greater part to species 
belonging to the anoplan genus Meckelia, viz. Meckelia - 
somatotomus (Leuck.), Meckelia (Nemertes) ligurica (Blanch), 
Meckelia Ehrenbergit (Dies.), Meckelia aurantiaca (Grube), 
and further to Pola delineata (Delle Ch.), Polia geniculata 
‘ “Transactions of the Royal Society of Edinburgh,’ 1869, and Ray 
Society’s publications, 1873 and 1874. 
* * Aontecheningen over de Anatomie Histologie en Ontwikhelings 
geschiedenis vaneenige Nemertines,’ Utrecht, 1874, and “ Untersuchungen 
uber Nemertinen,” in Niederlandisdisches ‘ Archiv fiir Zodlogie,’ Bd. oi; 
Heft 2, 1875. 
