12 University of Michigan 



by Andrews is too low, a fact probably to be accounted for by 

 the poor preservation of the material examined by him; he 

 counted: 42 to 45 + 13 to 16+8 or 9^64 to 69), Gonad 

 pouches 27 to 36 (averaging 33 in twenty counts) on each side 

 (sometimes there are one or two more on either the left or the 

 right side than on the other). Size unusually large (lengths of 

 mature specimens examined, 5.8 to 8.35 cm. ; of immature indi- 

 viduals, 3.75 to 5.6 cm.). Oral hood and cirri reduced in 

 size, and becoming smaller with age; the distance from tip of 

 rostral fin to oral sphincter contained 13.8 to 16.3 times in 

 total length in adults (10.5 to 14.6 times in adults of lance- 

 olatmn, floridae, bermudac^ and platac) ; this abbreviation of 

 the anterior end involves a reduction in the size rather than 

 as Kirkaldy (1895) states in the number of anterior myotomes. 

 Two of the other characters used by the same author, namely, 

 the form of the rostral fin and the curvature of the free ante- 

 rior tip of the notochord, are so altered by different methods 

 of preservation as to be unusable. 



Specimens from San Luis Gonzales Bay, Gulf of California 

 (collected by the Albatross), are not fully typical in the form 

 of tail and fins, but the differences may be due to the poor 

 preservation of the Gulf specimens. They vary in length from 

 29 to 63 mm., those 29 to 61 mm. long being apparently imma- 

 ture. Myotomes in two, 44+16+10^70, and 45 + 16+10=71, 



12. Branchiostoma tattersalli Hubbs, new species 

 Branchiostonia califoniiense Tattersall, 1903. 



Tattersall has suggested that the lancelet of the Cape of 



Good Hope, as well as his specimen from Ceylon, should be 



referred to B. califoniiense. This view appears so extremely 



improbable to the writer that he proposes a new name for the 



Ceylon specimen referred to. Careful comparison, no doubt, 



will disclose abundant differences, but at present the Ceylon 



