884 EECORD OF CDREENT RESEARCHES RELATING TO 



as in the former genus. It also may be placed provisionally in the 

 family SyllidcB. 



4. Phalacrophorus pichis (nov. gen. et sp.). — The length of the body 

 is about 6 mm. There are two simple eyes, sessile on the extremities 

 of the cerebral ganglion. The central lobe (Ruder) of the parapodia 

 is ciliated, the cilia being in some places collected into bundles, which 

 possibly represent the apertures of the segmental organs. The 

 pharynx is provided with a pair of curved jaws. This genus is con- 

 sidered as an aberrent form of the Lycoridce. 



5. Sacconereis Cannricnsis (^nov. spi.). — The author was prevented 

 from tracing out the whole life-history of this species, but the proba- 

 bility is that, as in the species described by A. Agassiz, the impreg- 

 nated egg gives rise to a sexless female or " nurse " (Autolytus), which, 

 by budding, gives rise to the male {Polyhostrichus) and female 

 (Sacconereis). The female was found with her ventral nidamental 

 pouch full of eggs and larva. Four stages of the latter are described, 

 and also a newly discovered larva, the adult form of which is unknown. 



6. Observations on the Tomopteridce. — There has been a good deal of 

 difference of opinion as to the presence of a pair of small appendages 

 on the head of Tomopteris, over and above the blunt frontal feelers 

 and the long bristled tentacles. Greeff considers that these are always 

 present, but that they have escaped notice owing to their small size, 

 and the fact that tlicy are often tucked in under the head, and frequently 

 broken off when the animal is caught. He calls them the first pair of 

 tentacles, the well-known long setose appendages being the second. 



Greeff has also investigated the "rosette-like organs," and his 

 results are entirely opposed to those of Vejdovsky.* He fails to find 

 anything of the nature of a lens, denies altogether the visual function 

 of the organs, and considers them to be parapodial glands. 



An account of the muscular system of T. Esclisclioltzii is given, and 

 the paper concludes with a description of three new species, T. 

 Kcfersteinii, T. levipes, and T. EschschoUzii. 



Annelid Jaws from Scotch and Canadian Palaeozoic Rocks.t— 

 Mr. G. J. Hinde describes fifty-five different forms, the greater propor- 

 tion of which are from Canada, the strata in which they were imbedded 

 being principally shallow water deposits. After referring to the very 

 few recorded instances of the discovery of any portions of the organism 

 of errant annelids as distinct from their trails and impressions in the 

 rocks, he describes the principal varieties of form and of the structure 

 of the jaws, classifying them from their resemblances to existing 

 forms under seven genera, five of which are included in the family 

 Eunicea, one in the family Lycoridea, and one among the Glycerea. 



The jaws occur as small, dark, shining objects, very varied in form, 

 dispersed through the rock, quite detached from each other and from 

 the positions they occupied in the head of the animal. The material of 

 which they are composed appears to be nearly entirely of a chitinous 

 character, and so far free from calcareous matter that it undergoes no 

 change in nitric acid. 



* This Journal, ii. p. 155. 



t ' Quart. Journ. Geol. Soc.,' xxxv. (1879) p. 370. 



