2 University of Michigan 



5. Allabenchelys longicauda Boulenger. — The two specimens 

 (112 and 113 mm. long to the caudal fin) of this aberrant genus 

 secured by Mr. Schwab at Efulan depart notably from Boulenger's 

 account of A . longicauda, the genotype and oldest species, in many 

 respects agreeing better with A. brevior Boulenger, which will 

 probably prove not to be a valid species. These two species, 



A. "brevior" 



Two Specimens 

 from Efulan 



A . longicauda 



Depth of body 



Length of head 



Width of bony casque in 



width of head 



Occipital foramen 



Eye in interorbital 



Interorbital width 



Length in width, premaxil- 



lary band of teeth 



Nasal barbel in head 



Maxillary barbel 



reaching 



Outer mandibular barbel .... 

 Inner mandibular barbel .... 

 Occiput to dorsal, in head . . . 

 Snout to pelvic, in pelvic to 



caudal 



Length of pectoral 



Pectoral spine 



Length of caudal 



Dorsal rays 



Anal rays 



7. 0-8. 5 



5-0-5-S 



ca. 2.0 

 small 



5.0-6.0 



3.0-4.0 

 I. 5-1. 67 

 = or < head 

 not beyond 



middle of 



pectoral 



I-33-I-5 

 I .67-2.0 



i-33-i-5 



I.5-I-67 

 ca. 2.0 

 feebly serrate 



65-75 

 60-65 



71-90 

 50-5.2 



small, but dis- 

 tinct 



5-4-6.4 

 2.3-2.4 



4 . 0-6 . o 



I -4-1 -75 

 < or > head 

 nearly to or be- 

 yond middle 

 of pectoral 

 I . i-i . 2 

 1 .67-2. 9 

 1-65-1.7 



1.65 



1.8 



weakly serrate 



I. 6-1 .65 

 83-88 

 68 (one) 



9.0-12.0 

 5 ■5-60 



3 °. 

 indistinct 



6.0 



2 + 



4.0-5.0 

 1.67-2.0 

 = or > head 

 middle or end 

 of pectoral 



1.0-1.5 

 I .67-2 .0 

 I. 5-1. 67 



1.75-2.0 



I .67-2 .0 



smooth or 

 slightly ser- 

 rate 



ca. 1.5 



80-90 



60-75 



until lately the only ones known, were both originally described 

 from the Ja River, Kamerun, but only longicauda has been recorded 

 from the Kribi. 



In the first and third columns of the following table are given 

 the characters assigned by Boulenger respectively to A. brevior 

 and A. longicaiida; in the middle column are listed the correspond- 

 ing characters taken from the two specimens in the collection being 

 reported upon. 



