430 Dr. F. Miller on some peculiar Structures 
The young with brown cross bands: the first is horseshoe- 
shaped, and encircles the occiput, each branch advancing to the 
eye; there are two irregular brown spots within its concavity : 
the second band occupies the posterior two-thirds of the neck : 
the third and fourth across the middle of the trunk : the fifth 
across the sacral region. ‘Tail with five brown rings. These 
bands and rings are ‘broader than the interspaces of the ‘st 
colour, which is brownish yellow. 
In the adult only the brown edges of these bands remain ; so 
that there is one pair of brown cross bars on the neck, and three 
pairs on the trunk, the space between the bars being of the 
ground-colour. The horseshoe- shaped band on the occiput re- 
mains single; but the markings on the head are more defined: 
than in the young one, viz. a pair of brown rings on the crown 
of the head, one cross band between the eyes, “and two on the 
snout; a longitudinal streak runs from the eye to the nostril. 
Lower parts white ; a group of indistinct brown dots on the 
elbows and knees. 
I am indebted to R.T. Riddell, Esq., for two specimens of this 
species : one is adult, 54 inches long, the length of the tail being 
24 inches; the other, young example is 3 inches long, tail 
1} inch. They were collected at Hydrabad, Sindh, where the 
species is unjustly reputed to be venomous. ° 
XLVIII.—On some peculiar Structures in the Seminal Fluid of 
Tanthina. By Fritz Mtxuer of Desterro*. 
Ir is but rarely that pelagic animals find their way into the arm 
of the sea which separates the island of Santa Catharina from 
the mainland of South America. Amongst these visitors, which 
are sometimes absent for several years together, are two species 
of fanthina, which usually make their appearance as attendants 
on swarms of Velelle. One of them with a more acute spire (J. 
extgua, Lam.), of which only a few females have once been seen, 
bears its eggs upon the frothy appendage of the foot: the other, 
which has been repeatedly found, has a flatter spire (J. pallida, 
Harv.), and is viviparous; in this I ascertained that the frothy 
appendage occurs in precisely the same manner in both sexes. 
In the seminal fluid of the latter species there are some very 
peculiar structures, to which I would call the attention of visitors 
to the Mediterranean and others who may have the opportunity 
of examining this remarkable Mollusk. It is very probable that 
such an opportunity may not occur to me again for years; and 
* Translated by W. S. Dallas, F,L.S., from Wiegmann’s ‘ Archiv,’ 1863, 
p. 179. 
