FISHES OF THE PHILIPPINE ISLANDS AND ADJACENT SEAS 305 



AeUopos MtJNSTEE, Neues Jahrb. Mineral., p. 581, 1836. (Type, Aellopos elongatus 



Miinster. ) 

 Euryarthrn Agassiz, Poissons fossiles, vol. 3, p. 382, 1843. (Type, Euryarthra 



munsteri Agassiz.) 

 Glaucostegus Bonaparte, Cat. Metod. Pesci Europei, p. 14, 1846. (Type, Rhino- 



batus cemiciilus GeofEroy Saint Hilaire=/2aia rhinohaios Linnaeus.) 

 Spathobatis Thioliji>ke, Ann. Soc. Agric. Hist. Nat. Lyon, ser. 2, vol. 1, p. 63, 



1849. (Type, Spathobatis bugesiacus Thiolliere.) 



Body depressed, gradually passing into tail. Tail depressed, ro- 

 bust anteriorly. Disk partly triangular, rounded and wider behind. 

 Snout elongate, pointed, formed by long rostral cartilage and vas- 

 cular area each side. Teeth obtuse, with indistinct transverse ridge. 

 Nostrils oblique, wide, front valves not confluent and not reaching 

 mouth. Spiracles wide, behind eye, mostly with two folds on hind 

 edge, rarely with one or none. Dorsals spineless, both behind ven- 

 trals. Caudal small, subcaudal part weak and without lobe. Pec- 

 torals rather narrow, best developed behind shoulder girdle, nar- 

 rowed to acute in front, not extended mto snout. Ventrals close to 

 pectorals. Claspers slender, pointed. 



Species numerous in warm seas, and vary greatly in the form of 

 the snout. 



Rhinobatos dumerilii Castelnau' is an imperfectly described and 

 doubtful species. 



Rhinobatos is the original way of spelling the name for this genus 

 and is so accepted here. 



ANALYSIS OF SPECIES 



a'. Leiobatus. Front nasal valve extends inward to some extent on internarial 

 space. 

 6\ Front nasal valve not extending inward much beyond level of inner nos- 

 tril edge, not nearly reaching that of opposite side. 

 &. Snout rather long; mouth width 3% to 3% in snout; space between 

 spiracles 2% to 3^/4 in snout. 

 d\ Eostral ridges widely separated throughout their length ; nostril length 

 1% times internarial; blunt tubercles down median line of back. 



holcorhynchus 

 dr. Eostral ridges approximated or narrowly separated anteriorly ; nos- 

 tril length 1% to 1% times internarial; tubercles in median line 

 of back very small or rudimentary. 

 &. Rostral ridges more or less separated throughout their length, ap- 

 proximated only at snout end ; horizontal distance from outer 

 nostril edge to lateral snout edge little less than nostril length. 



formosensis 



e^ Rostral ridges more or less approximated in front % their length ; 

 horizontal distance from outer nostril edge to lateral snout edge 

 greater than nostril length schlegelii 



' Proc. Zool. Acclimat. Soc. Victoiia, vol. 2, p. 148, 1873 (type locality: Western Aus- 

 tralia). — MACLEAT, Proc. Linn. Soc. New South Wales, vol. 6, p. 372, 1881 (copied). 



