04 



THE 



AQUARIUM 



@ 



Rays. Dorsal, 9/44; Anal, 3/39; Vent- 

 ral, 1/5; Pectoral, 2/ IS. 



Head completes anterior contour of 

 body. 



Eyes within anterior half of the head, 

 lateral with very slight ujnvard incli- 

 nation. 



Mouth obliquely cleft downwards and 

 backwards, lower jaw closing within 

 upper. 



(iills, anterior arch supporting eight 

 rows of teeth, (inim. in length, extending 

 from a point about directly below the 

 orbits, and continued forwards as rudi- 

 mentary tubercles of the apex of the 

 arch. 



Inferior phanuis^^eals support mi- 

 nute tubercles, while the remaining 

 branchial arches are toothless, their 

 places being taken by rudimentary tu- 

 bercles. 



Pseudobranchia^ well developed. 



Rays. Dorsal, 53. Anal, 41. 



Tail. Deeply and acutely bifurcated. 



Fins. Dorsal and anal, deep and 

 broad, the dorsal commencing and end- 

 ing with very short rays, intermediate 

 ones graduated from end to end. Anal 

 rays, anteriorly, very long, becoming 

 gradually shorter, to terminate in a very 

 short extreme posterior one. Pectoral 

 rays long and fin narrow. Ventrales, 

 anterior, small. 



Skeleton exhibits subtypical charac- 

 ters of a Scombridean. 



Cranium and Ribs, as given above. 



Post-temporal, bifurcated, either bifur- 

 cation flat and broad. 



.Supraclavicle, long and narrow. 



Postclavicle, with a long styliform pro- 

 cess. 



Hypocoracoid, narrow and directed an- 

 teriorly. Mesial border formed partly in 



membrane; oval notch below its center. 



Pelvic girdle, small and slender. 



Ribs are 23 in number, of which 

 twenty of the posterior pairs exhibit an 

 unusual development. They are broad 

 and hollow, and taken as a whole, form 

 an osseous wall without open intervals 

 as the ribs overlap. They are abbrevi- 

 ated, being attached to the downwardly 

 produced vertebral apophyses in such a 

 way that their truncated superior por- 

 tions arrive at the center of each cor- 

 responding vertebra. The leading an- 

 terior rib is articulated with the third 

 vertebra, and is much reduced. Second 

 and third ribs somewhat broader at their 

 articular ends, but taper rapidly to their 

 free lower extremities, terminating in a 

 long, filiform ventral free end. 



.Spinal colu)nn, composed of 50 verte- 

 brae, of which 24 are thoracic, and 2() 

 are caudal. Centrum of first vertebra 

 is rudimentary in character, but with 

 well developed neural spine. 



Ribs, articulate wath the third to the 

 twenty - fourth vertebra, inclusive. 

 (Characters of the vertebr(e have been 

 given in full by Professor Collett, and 

 are reproduced in my translation, loc. 

 cit., pp. 48, 49). 



Secondary ribs occur on all the an- 

 terior vertebrae, disappearing on the 

 second or third ultimate abdominal ones. 



On first and second vertebrae, they 

 articulate with the ha-mal arch; on 3-7 

 with the vertebral centra; and the rest 

 with the anterior surface of the dorsal 

 margin of the rib. 



Branchial arches, missing in all (?) the 

 specimens; (need description from future 

 material). 



To be successful you must plan the 

 start as well as the finish. 



