ART. 9 A POLLACK WHALE FROM FLOEIDA MILLER. 5 



tion of the squamosal and the less concave lower border and less 

 evenly crescentic form of this bone when viewed from the side (pos- 

 terior limb of crescent much wider (deeper) than anterior limb) ; (/) 

 the unusually deep and naiTow sulcus formed at the region of junc- 

 ture between the squamous and articular portions of the squamosal 

 (see pi. 4, sq. sulc; also compare pi. 2 with True's pi. 2, B. physalus, 

 pi. 24, B. aciitorostrata^ pi. 30, Megaptcra, and pi. 47, RhacManec- 

 tes) ; and {g) the depth, particularly on the inner side, of the groove 

 lying between the articular and angular portions of the mandible. 



In addition to these characters which distinguish it from the skulls 

 of both the Common Finback and the Pike Whale the skull of the 

 Pollack Whale may be recognized as follows : 



As compared with the Common Finback (see pis. 1, 2, and 3, also 

 pis. 41 and 42 of Andrews's monograph; compare with pis. 1-4 of 

 True's Wlialebone AVliales of the Xorth Atlantic) : Nasal bones [a) 

 much larger, their anterior border extending forward about to level 

 of anterior border of posterior maxillary concavity instead of fall- 

 ing conspicuously short of this level, {h) their anterior margin nearly 

 straight instead of deeply concave, (r) the greatest coml)ined width 

 of the two bones much less than length of median suture instead of 

 about equal to median suture; nasal process of maxillary conspicu- 

 ously broader, its least width contained about two and one-half 

 times instead of about five times in its length. 



As compared with the Pike "\Aliale (compare with pis. 22-27 of 

 True's Whalebone AVhales) : Extreme of contrast between size of 

 rostrum as compared with rest of skull; less relative width of in- 

 termaxillary gutter immediately in front of nasals; audit<)ry bulla 

 relatively smaller (its length about one-third width of basioccipital) ; 

 jugal relatively shorter (its length contained about two and one-half 

 times instead of about one and one-half times in lengtli of outer 

 portion of articular process of squamosal). 



Vertehrce (pis. 5-15). — The vertebral formula is C. 7, D. 14, L. 

 13, Ca. 19 (-f4?)=57. The boundary between lumbars and caudals 

 is not certain. There appear to be four caudals lacking at the distal 

 extremity of the series. Last vertebra with neural spine. No. 46; 

 last with distinct tranvei-se process. No. 43 (vanishing traces on Nos. 

 44r-46) ; first with perforated transverse process, No. 38. 



In its general features the vertebral column is characterized by the 

 height and erectness of the spinous processes, peeuliarities that are 

 most noticeable at the middle of the series. In the last dorsal and 

 first seven lumbars the length of the spinous process equals about 

 three times the depth of the centrum, while in the Connnon Finback 

 from Maryland figured by True (pi. 5) the processes are barely twice 

 as high as the centra. In the skeleton from Danzig, Germanv. figured 



