Pisces. 177 



TREMATOMUS, gen. n. 



Differing from Notothciiia in the scapular fenestra being pierced 

 in the scapula instead of between the latter and the coracoid. 



Synopsis of the SjJccics. 



I. Interorbital width 3 to 85 times in length of head; lower jaw projecting 



beyond upper ; gill-rakers 18 to 20 on lower part of anterior arch. 



D. VI-YIII, 32-36: A. 32-33; Sq. 90-100 3-^; lateral 



lines strongly marked, tubular 1. newnesi, sp. n. 



D. V-YI, 34-37; A. 31-33; Sq. 97-110; lateral lines ill- 

 defined 2. horchgrev'inl-i, sp. n. 



II. Interorbital width 4i to 5^ times in length of head ; lower jaw not projecting 



beyond upper ; gili-rakers 12 to 15 on lower part of anterior arch. 

 D. V-VII (usually YI), 38-41 ; A. 34-35 ; Sq. 65-75 ^^ ; 



interorbital region scaly 3. Jiansoni, sp. n. 



D. IV-VI (usually V), 35-38; A. 32-35; Sq. 66-80 ~; 



interorbital region naked or with a few scales 4. lernacchii, sp. n. 



As regards the skeleton, which I have been able to examine in 

 the four species, the characters are essentially the same, except that 

 the ossification is stronger, and the skull more massive, in the species 

 of Group I. than in those of Group II. The parapophyses begin on 

 the second or third vertebrae and soon become very strong ; they 

 bear the rib and the epipleural, which are inserted close together. 

 Number of vertebrae : — 



T. newnesi. 20 + 34 = 54 



T. lorchgrevinki. 20 4- 32 = 52 



T. hansoni. 21 4- 35 = 56 



T. bernacchu. 17 4- 35 = 52 



3. Teematomus newnesi, sp. n. 

 (Plate XL) 



Depth of body 4 to 4| times in total length, length of head 

 3^ to 4 times. Diameter of eye 3 (youug) to 4 times iu length of 

 head, interorbital width 3 to 3|- times ; maxillary extending to below 

 centre or posterior third of eye ; lower jaw projecting beyond the 

 upper ; upper surface of head naked ; cheek and opercle densely 

 scaled. Gill-rakers long and slender, 18 to 20 on lower part of 

 anterior arch. Dorsal VI-VIII,^ 32-36 ; longest rays f to ^ length 

 of head. Anal 32-35 ; longest rays i- length of head. Pectoral 



' Out of 70 specimens, 48 have VII, 19 have VIII, and 3 have VI. 



N 



