478 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
the extreme difficulty of determining alcoholic specimens, and urges 
that species should be studied as fully as possible while living, and 
preserved as microscopic preparations to show their anatomy. 
Eustylochus (for Planocera elliptica Girard) is a new genus which, 
externally, agrees with Stylochus, but differs in the structure of its repro- 
ductive organs ; Planoceropsis is a new subgenus of Planocera with 
marginal ocelli. The number of new species is hardly as large as one 
might have expected. 
Dinophilidae of New England.* * * § — Prof. A. E. Yerrill describes two 
species which appear to be the only known representatives of this group 
on the New England coast. He calls them DinopMlus pygmseus and 
D. simplex , though they differ considerably in structure ; the latter may 
not be a true Dinophilus. 
Marine Nemerteans of New England and adjacent Water s.t — 
Prof. A. E. Verrill offers an article which is intended as a descriptive 
catalogue of all the Nemerteans of the north-eastern coast of North 
America that have been observed with enough care to permit him to 
give a description presumably sufficient to enable ordinary observers to 
identify the species when seen living. He particularly notes any of the 
few cases in which descriptions have not been made from living speci- 
mens. As a rule, undetermined alcoholic specimens of Nemerteans, 
unaccompanied by notes on their forms and colours while living, cannot 
be identified with certainty, unless they belong to genera which contain 
very few and widely differing species. 
The author has had to do with collections which include several 
thousands of specimens, and which represent very fully the Nemertean 
fauna of the coast from Cape Hatteras to Labrador, and from high-water 
mark to 2000 fathoms. These worms are much more abundant from 
1 to 60 fathoms than at greater depths. 
The only two remarkable new forms described are examples of 
pelagic Nemerteans, taken in the region of the Gulf Stream. In form 
they resemble Sagitta, but they are much larger and stouter, and the 
general organization is not very different from that of the typical Enopla. 
The author forms, however, a new family for them, which he calls that 
of the Nectonemertidae. With some affinity to Pelagonemertes they differ 
by their form, distinct head, caudal fin, and absence of much subdivided 
intestinal diverticula. The two new genera are called Nectonemertes (for 
N. mirabilis sp. n.) and Hyalonemertes (for H. atlantica sp. n.). 
Nemertea of Lake Geneva. J — Dr. G. du Plessis points out that 
Mr. L. Vaillant is wrong in asserting that the Nemerteans discovered 
by du Plessis in Lake Geneva belong to the genus Geonemertes. For 
the forms in question are wholly aquatic, are provided with cephalic 
slits and lateral organs, have separate sexes, and so on; they are 
certainly not related to Geonemertes. They are of much interest as 
forming part of a “ Fauna relicta.” 
Reproduction of Geonemertes australiensis.§ — Dr. A. Dendy 
reports that the eggs of this worm are about 0 • 6 mm. in diameter, and 
* Trans. Connect. Acad., viii. (1893) pp. 457 and 8 (2 figs.). 
t Tom. cit., pp. 382-456 (7 pis.). 
X Zool. Anzeig., xvi. (1893) pp. 19-20. 
§ Proc. Koy. Soc. Victoria, 1892, pp. 127-30 (from separate copy). 
