PLATE II. 



•J. Integument. 



M. Musculature. 



W. Blood-space. 



aPr. Rljyncliodieum. 



Po. ProT)oscitUau opening. 



Ps. Proboscidian slieatli-cavity. 



Pr. Proboscis. 



P>. Intestinal cavity. 



C. Brain-lolie.s. 



Comrn. Inferior brain coniini.s.sure. 



iV. Lateral nerve-truidcs. 



Im, cm. Musculature of the proboscis. 



ie. Epithelium of do. 



P,X. Nerve-stems of ilo. 



Figs. 1-7. Cariiiina grata, n. gen. et sp. Transverse sections and parts of sections of one of the specimens in wliich the 

 proboscis was protruded and ejected from the body — drawn with the camera. The integument and what 

 pertains to it is tinted light sepia, the nervous system yellowish, the muscular investment of the body red, 

 the intestinal epithelium grey. 



Fig. 1. Section through the tip of the head and the anterior point of meeting (bl) of the two lateral blood-spaces. 

 The terminal furrow at the tip of the head {rf. PI. I. tigs. 1, 3) has been touched in the left lower 

 corner of the section. 



Fig. 2. 



Fig. 3. 

 Fig. 4. 

 Fig. .1. 



Section somewhat further back in which the blood-space shows a right and a left portion, and iu which the 

 anterior wall of the rhynchod.'eum [cf. fig. 8, aPr) has been touched, the first indication of the opening 

 through which the ]»roboscis is thrust forward being also visible in this section. 



Section thi'ough the brain thickenings (cc), the ventral commissure and the prwstomial lilind portion of the 

 cesophagus. 



Section through the mouth region. To the left the blood-space ap]iears to be locally subdivided by radial 

 strands of tissue. 



Section through the (esophageal region. The layer of longitudinal and inner circular muscle fibres are 

 separated by a thin black line. The blood-spaces are more or le.ss enclosed in the latter layer. 



Figs. 6, 7. Two sections, still further back, of the inner circular muscular layer and what is encompassed by it. 

 These sections show the change m shape which both the proboscidian .sheath-cavity and the blood- 

 spaces undergo in different portions of the body. 



Fig. 8. Cariniua (frala, n. gen. et sp. A horizontal section through the head, brain-lobes and proboscidian insertion of 

 the second specimen, in which the proboscis had remained attached and inverted {cf. PI. III. fig. 4). 



Fig. 9. Cariniua r/rata, u. gen. et sp. Section further backwards {cf. fig. 3). (The specimen being curved this section 

 and the following arc no longer horizontal but transverse). 



Fig. 10. Cariiiina- i/mla, n. gen. et sp. Section further backwards still {cf. fig. 5). 



Figs. 9 aud 10, when compared with tigs. 3 and 5, give an idea of the change effected upon the body musculature 

 by the inversion and eversion of tlie proboscis. Some latitude must, however, be left for the fact of the 

 specimens being diffei'ent. 



Figs. 11, 12. Carininu t/raia, n. gen. et spi. Two transverse sections through the proboscis, with the external thin homo- 

 geneous layer enclosing the outer longitudinal (brown) and inner circular (red) muscular layer. Inside the 

 latter is the proboscidian epithelium. The two strong nerves of the piroboscis are still enclosed in thi.f 

 epithelium, as are the nerve-trunks of the body in the integumeut. 



