li 



K. MITSUKURI : STUDIES ON 



Texlfig. 34. 



Laiinogone parva : a — Wlieel-like 



plate of (lorsivl papillii ; h — Same of 



pedicel ; c — Complex plate of pedicel ; 



d — Supporting rod of pedicel. ( x 240). 



smaller lioles typically ten in 

 number. ISIoreover they are vault- 

 ed witli tlie center highest. Those 

 in the dorsal papilte are 0.035 — 

 0.045 mm. in diameter (textfig. 

 Bib). Sometimes they are oval, 

 being slightly longer in one di- 

 ameter than in the one at right 

 angles to it. In the ventral pedicels, 

 there are similar wheel-like plates, 

 but most frequently there is a 

 tendency to produce a second 

 circle of small openings. Many have several circles of holes 

 (c). The ventral plates are all much larger, 0.06 — 0.075 mm. 

 in diameter (a). There are irregular, bent, thorny suj^porting 

 rods in the wall of the pedicels and the papillos (d) ; well- 

 developed end-plates in the pedicels ; and much curved rods in 

 the tips of the tentacles, very much like those in LaAmognne 

 selcnkai. 



Kanarks : — The specimens in alcohol measured respectively 

 2.8x0.45 mm. and 1.9 x0.3 mm. They are, I believe, adults; for, 

 in one specimen (No. 1496) not larger than the three mentioned 

 there are to be seen some eggs which have burst out at the dorsal 

 median line in front. 



Althougli 1 am unable to make out some anatomical details 

 such as the calcareous ring, the presence or absence of the tentacular 

 ampulla?, or the number of genital organs, I do not think there 

 can be much doubt that this species belongs to the subfamily 

 Deimatin;ie, and to the genus Lcctmogone. This species is very 

 clearly distinguishable from others of Laimofjonc by its calcareous 



