B1LEMNO8I8, BE] . -I-IKI 1.1 i:o~ ru \. 



ana* CONOTEUTHIS, d'l 



('. DVPINIANUB, d'Orb. PI. 95, fig. 462, tf eocomian of 



Onl\ s|>,-i-it-s. 



Genus BELEMNOSIS, Bdl 



r. PL ic AT A, Edwards. PI. '.;. ii<.-. \\\:\. Eocene, London, Only 

 species. 



Genii* BELOPTERA, lh-1.. 



Koin specie-. Koceiie of l':iris :iinl Uracklesh.-i m. 

 II. BELEMNITOIDE8, IJIainv. I'l. '..">. li^. <i'.4. If,."). Pal 



Genus SPIRULIROSTRA, d'Orb. 



S. BKLI. \i;mi, d'()rl>. I'l. ( .i:>. lir. -HiC,. Tertiary >!' Turin. 

 Only S|HTH>S. 



Family XIV. SIM K r LI D.I-:. 



(it-mis SPIRULA, Linn. 



t liou>:iii<ls of shells of tlu-M- prla^ic iiiollusks ar- 

 washed ;i<hmv in all parts of tin- world, tin- animal is almost un- 

 known ; hut two perfect specimens having been obtained in Xe\\ 

 Zealand, which, with two or three of other individuals in had 

 condition, have l>een carefully examined by Prof. Owen and 



others. 



Prof. O\ven'> last mi-moil- on the S/n'ruld adds materially to 

 what wa> heretofore known respecting this strange animal." 1 He 



shows that the mantle termina te- posteriorly in two lateral tlaps 

 which cover the sides of the shell, and leaving it partlx <-\ 

 po-rd dorsally and ventrally. I'o.xti-riurly. bt-twt-en tin- lobe- i- 

 an ellij>tical convex body with a central depression or disk. 

 flunked by :( pair of olilon^ ]rodnct ioii>. perhaps homologous 

 with fins, or at any rate resembling the -.mall lateral-terminal 

 tin- of A,o////oy/s/.<. The terminal disk is. perhap> (:. Ion- 



'ibe<l by liuinpliius). a true -uck'-r. enaltliim tin- animal to 



'I., iii 1. 



