352 Dr. J. E. Gray on the Whalebone- Whales. 
3. PHysaLus. 
The second cervical vertebra with a broad expanded lateral 
process, with a large perforation in the upper part of its base. 
The first rib with a simple compressed head, and with a com- 
pressed internal process near the condyle. Lower jaw-bones 
thick, convex on the sides, with a distinct conical coronoid pro- 
cess. Ribs 14 to 16. Vertebree 60 or 62. 
1. Physalus antiquorum, Gray, Proc. Zool. Soc. 1864. 
The lateral processes of the 3rd, 4th, 5th, and 6th cervical 
vertebre broad, ring-like; the lateral processes of the 2nd cer- 
vical elongate, oblique, truncated. Ribs 14. 14. 
Hab. Northern Seas. Skeleton, Mus. Brit. and Alexandra 
Park. 
2. Physalus Duguidii, Gray, Proc. Zool. Soc. 1864. 
ibs ES <1. 
Hab. Northern Seas; Orkney. Cervical vertebrae, Mus. Brit. 
3. Physalus Sibbald, Gray, Proc. Zool. Soc. 1864. 
Ribs 16.16. Ramus of lower jaw conical, high. 
Hab. North Sea; mouth of the Humber. Skeleton in Hull 
Museum. 
4, SIBBALDUS. 
The second cervical vertebra with a broad elongated lateral 
process, perforated at the base. The first and second ribs double- 
headed. Lower jaw-bones compressed, high, flat on the sides, 
with a distinct conical coronoid process. Vertebre 55. Ribs 
13 or 14. Arm-bones slender. 
1. Stbbaldus laticeps, Gray, Proc. Zool. Soc. 1864. 
Balenoptera laticeps, Gray; Lilljeborg, J. c. p. 63. 
Ribs 138.18. Dorsal fin compressed. 
Hab. Northern Seas. Skeleton, Mus. Berlin. 
2. Sibbaldus Schlegelit. 
Balenoptera from Java, Schlegel, Mus. Leyden. 
B. Schlegel, Flower, MS. 
“ Megaptera from Java,’ Van Beneden, Gray, Proc. Zool. Soc. 1864, p. 208. 
Hab. Java. Skeleton, Mus. Leyden (young); skull, Mus. 
Leyden. 
3. Sibbaldus borealis, Gray, Proc. Zool. Soc. 1864. 
Balenoptera gigas, Reinhardt & Lilljeborg. 
Ribs 14.14. Dorsal fin small, far back, on a prominence. 
Hab. Northern Seas. Skeleton, 
