Miscellaneous. BA 
On the Habitat of Peristethidion prionocephalum, Dum. 
By Dr. A. B. Meyer. 
M. A. Duméril described and figured in the year 1868 (‘ Nouy. 
Archives du Musée d’Hist. Nat. de Paris,’ vol. iv. p. 115, pl. xxii. 
figs. 1 & 2) a new species of Peristethidion, with the remark that it 
was ‘“recu de la mer des Indes, sans indication précise d’origine.” 
Mr. Riedel, of Gorontalo, in Celebes, asks me to make known, in 
his name, that the specimen was sent to Paris by him, and that the 
exact habitat is Gorontalo, North Celebes. 
Anatomy of a Remarkable Type of the Group of Nemertians 
(Drepanophorus spectabilis). By M. A. F. Marron. 
In his memoir on the Nemertians, M. de Quatrefages has indi- 
cated under the name of Cerebratulus spectabilis a curious species, 
to which he ascribes a proboscis furnished with a denticulated plate. 
The position and relations of this strange armature are unfortunately 
not exactly indicated by the French naturalist ; and hence M‘Intosh 
has recently expressed doubts as to the truth of the assertion, 
although Grube, in mentioning the occurrence of Cerebratulus spec- 
tabilis in the Adriatic, says, ‘ Proboscide falcicula denticulata in- 
structa.” Itis true that the Silesian zoologist has only given a few 
words to this Nemertian. 
I have collected in the Gulf of Marseilles some worms of this 
species, and I can assert the correctness of M. de Quatrefage’s de- 
scription. Ihave moreover ascertained that Keferstein examined 
the same animal at Saint-Waast-la-Hogue. The Borlasia splendida 
of the “ Untersuchungen iiber niedere Seethiere”’ is only a Cere- 
bratulus spectabilis of which the armature of the proboscis was not 
recognized. Lastly, I must cite a recent memoir by M. Hubrecht, 
which I was unable to consult until my own researches were finished. 
M. Hubrecht observed some specimens of Cerebratulus spectabilis at 
Naples, and established for them the genus Drepanophorus. The 
anatomical part of this memoir is unfortunately incomplete ; and I 
therefore hasten to publish the results that I have obtained. 
The largest individual that I have examined was 68 millims. in 
length. I was able to understand the arrangement of the integu- 
ments by operating upon living individuals. I believe that there 
exists beneath the hypoderma a structureless basilar layer. The 
annular muscular fibres are very delicate, and differ completely 
from the longitudinal bundles; the latter, in transverse section, 
have the pennate appearance indicated by Schneider and Clapa- 
rede in the musculature of the earthworms and of some Chetopod 
Annelides. 
The vascular apparatus of this Nemertian presents the surprising 
peculiarity of containing elliptical globules, slightly flattened, and 
of a red colour identical with that of the blood-globules of man. 
Their longest diameter is 0:01 millim. In their centre a darker 
portion is seen, although it is not possible to distinguish the elements 
