SPENGELTA, A NRW GENUS Ol' ENTEROPNETTSTA. 625 



9. Posterior, paired, pr£elie|)atic in- Ditto. 



testinal pores present. 

 10. Accessory genital pores present. Ditto, 

 whicii, wlieu tliey occur latcrad 

 from tlie main series, i)ei I'orate 

 the longitudinal musculature. 



Spengelia agrees with Gland iceps in the characters mentioned 

 in the above table under Nos. 1, 2, 3, o, 7, and probably 6.' 

 It only agrees specially with Schizocardium in the possession 

 of synapticula (No. 4 in above table); this being also a marked 

 Ptychoderoid feature. 



A further most interesting reminiscence of the Ptychodera 

 type in the organisation of Spengelia is the occurrence of 

 vestigial roots arising from the dorsal side of the collar nerve- 

 cord. 



Spengelia porosa, nov. geu. et sp. 



External Form. [See PI. 47, fig. 1.] 



The proboscis was longer than the collar^ measuring, when 

 extended, 10'5 mm. 2 It was pear-shaped, and of a rich yell on- 

 colour. The collar measured 6"25 mm., and was coloured a 

 rich orange, especially in the middle region, while the posterior 

 region of the collar was whitish yellow. The rest of the body 

 had a dull yellow colour. 



The branchial region was 30 mm. in length, and in this 

 region the body was quite cylindrical and faintly annulated. 

 The post-branchial portion of the body, present in the spe- 

 cimen, measured about 20 mm. 



Apart from the absence of genital pleura, Spengelia was 

 readily distinguished from among the multitude of Ptycho- 

 dera flava by the length of the proboscis and the bright 

 orange-coloured collar. 



But what at once distinguishes Spengelia from any other 

 Enteropneust hitherto described is the occurrence on each 

 side of the dorsal middle line of a series of deep dermal pits 



^ Unfortunately the post-genital region was lacking from my specimen. 

 2 After preservation in a picro-acetic mixture the proboscis measured 

 5'25 mm., and the collar 4 mm. 



