260 DR. C. T. TEECHMANN ON THE [vol. lxxix, 



Belemnites (Belemnopsis) sp. (PI. XVI, figs. 15 & 16.) 



Description. — The guard increases very gradually from the 

 alveolar region to a point some distance behind it, maintains the 

 greatest section for a short distance, and then tapers gradually to 

 the apex. The ventral furrow is more or less broad with rounded 

 floor and sides, and extends from the alveolar region nearly or 

 quite to the apex. In this respect it differs from the belemnites 

 in the higher beds at Te Puti, in which the furrow is less 

 pronounced and dies away before reaching the apex. 



Dimensions. — Length of guard = about 90mm. 



Local ity. — Te Ahu Aim, Kawlria. Near the old Wesleyan 

 Mission Station, where rolled fragments are common on the shore. 



Remarks. — Two broken guards in my collection may belong to 

 different species. The cross-section is more nearly circular, and 

 the ventral furrow is broader and shallower in one than in the 

 other. They agree well with JB. taliabuticus G. Boehm 1 (pi. xi, 

 figs. 5 a-5 c, 6 a-Q c, 7-8, especially figs. 5 & 6 and cross-section, 

 fig. 8). The ventral furrow resembles that in JB. galoi Boehm 

 ■(pi. x, fig. 5 b) ; but the cross-section in that form is considerably 

 wider than it is dorso-ventrally, and the guard is widest towards 

 -the apex. They also resemble JB. alfuricus Boehm, a form which 

 is very near to JB. gerardi Oppel of the Spiti Shales. JB. galoi., 

 JB. taliabuticus, and JB. alfuricus occur in the ' Oxfordian ' beds 

 of Wai Galo, in the Island of Taliabu. 



Belemnites (Belemnopsis) sp. (PI. XVI, fig. 12.) 



Description. — The ventral furrow is faint, and extends from 

 the alveole backwards to within three-quarters of the length to the 

 apex. At first, it is narrow and rather deep, but gradually widens 

 •out, becomes shallower, and disappears. Where it disappears, 

 and towards the apex, the cross-section of the guard is nearly 

 •circular. The narrowest part of the guard is immediately behind 

 the alveolar region, where it measures 10 mm. across and 11 or 

 115 mm. ventro-dorsally. At the thickest part, which occurs 

 where the ventral furrow begins to die away, it measures 10 - 5 mm. 

 across and 12 mm. ventro-dorsally. 



Very faint, broad ventro-lateral furrows extend backwards for 

 •some distance behind the alveolar region. If one uses a lens, the 

 surface of the guard is seen to bear very faint longitudinal strise. 



Dimensions. — The length of the guard and part of the alveolar 

 •chamber of one specimen is 82 mm. Another less perfect specimen 

 has been about 110 mm. long. 



Locality. — Te Puti Point, Kawhia, Upper Jurassic; found 

 in situ in the cliff. 



Remarks. — This belemnite does not seem to agree exactly with 

 any of the forms figured by Bcehm from the Sula Islands, but 

 comes nearest apparently to JB. lagoicus Boehm, except that in the 



1 ' Die Siidkiisten der Sula-Inseln Taliabu & Mangoli ' Palseontographica, 

 Suppl. iv, pt. 2 (1907) p. 73. 



