1866. | Zoology and Animal Physiology. 603 
of this most interesting animal exists, and hence the importance of 
the work. Mr. Flower further adds some notes on the skeleton 
lately acquired by the College of Surgeons. The second memoir 
is by the late Professor Eschricht “On the Species of Orca inhabit- 
ing the Northern Seas.” He carefully decides on three species, 
instead of one only as had been supposed. The third memoir, on 
Pseudorca crassidens, is by Professor Reinhardt. He has given 
a careful and detailed description of the external and osteological 
characters of this remarkable form of Cetacean, hitherto only known 
by a skull exhumed from a fen in Lincolnshire, and therefore 
thought to have been long extinct. The sudden appearance of 
several individuals of this species on the coast of Denmark in 1862, 
shows how much may still be unknown of the Cetacean life, even 
in seas most frequented by civilized and observing man. The 
fourth memoir is by Professor Lilljeborg, “On the Scandinavian 
Cetacea.” The most important novelties in it are the descriptions 
of two perfectly distinct species of large whales found in a sub- 
fossil state in Sweden. 
The publication of a supplementary volume to Professor Hitch- 
cock’s great work “On the Ichnology of the Connecticut Valley” 
is of some interest. From various considerations adduced, such as 
the bird-like character of the foot markings, and the evidence that 
the individuals were quadrupeds, we must be fully prepared for the 
discovery of Reptilian Birds and bird-hke reptiles, filling out the 
class Saurornia, lately proposed by Mr. Seeley to receive the Ptero- 
dactyls. Good evidence is now accumulating of many links between 
the reptile and bird, already considered as most closely related. 
We have a bird with teeth and a long tail and hooks on its wings, 
in the Archxopteryx; we have a reptile with wings and probably 
plumage in the Pterodactyl ; and now it appears from the evidence 
of the sandstones of Connecticut, that there existed strange four- 
footed birds, the wings probably provided with feet at their ex- 
tremities, also possessing long tails and covered with feathers. 
In a late number of ‘ Wiegman’s Archiv., Herr Ehas Mecznikow 
describes some of his observations on the ciliated worms, or 
Turbellaria, in Heligoland. He has found that a very curious 
form, Alawrina, found by Busch at Malaga, and also by Claparede 
off Scotland, and considered by them as a larval form, is the re- 
presentative of a distinct group among the Rhabdoccela, or straight- 
gutted Turbellarians. He met with similar forms in Heligoland: 
all were composed of four parts, of which the foremost was longest, 
the total length being only 14 millimetres. The anterior part was 
furnished with a tactile proboscis, as in the animals of Busch and 
Claparede, whilst a long seta existed at the posterior end, and the 
body, of a pale-citron colour, was covered with a dense coat of fine 
cilia. The nervous system was obscure; the mouth, situated on 
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