MAMMALIA. 
47 
Zool. Soc. 1865, p. 357), tlio author was enabled, through the 
kindness of Mr. Layard, to examine the specimens themselves, 
and to complete his previous notes (ibid. p. 522). The collec- 
tion consisted of the skulls of seven species, viz. Delphinus 
doris (Gray), Delphinus eUphrosyne Sieno frontatus 
(Gray), Steno capensis (sp. n., p. 522), Grampus richardsonii 
(Gray), of the skull of which a description is given (p. 522) > 
Ziphius layardi (sp. n., p. 358, with a woodcut, and p. 523), 
and Petrorhynchus capensis (g. and sp. n., p. 524, with wood- 
cut) capensis (p. 359), 
The study of the skulls of the last-named species, and of 
Ziphius indicus (Van Ben.), has induced the author to reconsider 
the arrangement of Ziphioid Whales, which he now forms into 
a family, Ziphiidce, with the following characters : — 
Head beaked ; blower linear, transverse, on the back of the bead. The 
upper jaw toothless, or with a few rudimentary teeth ; lower jaw with a few 
teeth on the side or in front, which are sometimes early deciduous or not 
exposed. Body elongate j’" dorsal fin falcate ; pectoral fins small, low down, 
and rather close together on the middle of the chest ; fingers five, of four or 
five phalanges. Skull with an enlarged nasal over the blowers, which are 
more or less sunken. 
This family is subdivided thus 
I. IlyrEROODONTiNA, with Hyper oodon and Lagcnocetiis. 
II. ICrionoNTiNA. Tooth in front of lower jaw cylindrical or conical. 
Beak conical; the intermaxillary enlarged behind, forming a more or less 
large cavity round the blowers. 
1. Aliama*. Vomer simple ; intermaxillary only slightly elevated on 
the sides of the blower. Teeth large. Ziphius indicus (Van Ben.). 
2. Epiodon, Vomer forming a sunken groove; intermaxillary form- 
ing a moderately high basin round the blower. E. desmarestii=: Ziph. 
emVos^m (Cuv., quaere Gervais?)*. 
3. Petrorhynchus (g. n.). Vomer swollen, forming a large, prominent, 
elongate, pyriform pad between the callous intermaxillary ; intermaxillary 
forming a high basin round the blower. P. capensis (sp. n.), from the 
Cape of Good Hope. 
HI. ZiPHIINA. 
1. JBerardiuSy type B. arnouxii, 
2. Ziphius, type Z. micropterus. 
8. Dioplodon, typo Z. sechcllcnsis. 
* In 1864 Dr. Gray premosed the generic name of Aliama for the Del- 
phinus desmarestii (Proc. Zool. Soc. 1864, p. 242), and therefore this name 
cannot be applied again to a different type. However, we may add, antici- 
pating the Record of next year, that in the ^Catalogue of Seals and Whales, 
1866,’ the author reunites Ziphius indicus and, Petrorhynchus into the same 
genus, having had an opportunity of examining a cast of the skull of the 
former species. 
