^'Th'J^!'] i'K(K'eeuing;s of tiik national museum. 149 



7. Anemouia ( '!j inequalis sji. iiov. 

 Plato XXXIV, Figs. 111-115. 

 No. 7413. I'icliiliiiiL^iHi I>ay. Lower Culilbniia. Uittolal. Two specimens. 



The two specimens wliicli represent this species are contracted, though 

 tlie tentacles are not coinph^tely con(;eale(l. Tlie base-was adlierent. 

 In height the hirgest specimen measures 0.7"", with a diameter of 1.3'"'. 

 Tlie column wall is thin and soft to the touch, and shows 72 lougitud- 

 inal lines which mark the insertion of the mesenteries. The ectoderm 

 is completely maceiated away. The mesoghea is fairly thick and is 

 homogeneous in appearance, with numerous cells scattered through the 

 matrix. A sphincter is present; it is endodermal and of the '' diffuse" 

 variety, forming, however, a not very compact mass and being rather 

 weak. (PI. XXXIV, Fig. lU.) 



The tentacles are short, and a[)[)arently thirty-six in number, ar- 

 ranged in a single cycle. Tlieii* (ectodermal muscles are weak and are 

 not embed(l(Ml in the mesogbea. 



The stomat')d;eum is ridged longitndinally and possesses at least one 

 shallow siphonoglyphe. in half the circumference of one specimen ex- 

 amined eighteen pairs of mesenteries w«*re i)resent, from which it may 

 be conclnded that there are altogether thirty-six pairs, a number which 

 corresponds with the number of longitudinal lines seen from the 

 outside. Their arrangement is very pe(!uliar. All are perfect a)>ove, 

 but below they are evidently divided into three cycles, each consist- 

 ing of twelve pairs. If the iirst cycle be considered to represent two 

 primitive cycles, the apparent second cycle will really represent the 

 third cycle, while the apparent tliird will be the fourth, in which, how- 

 ever, only half ihv, proper number of pairs has developed (PI. xxxiv. 

 Fig. 115.). The mesoghea of the mesenteries resembles that of the 

 column wall, being homogeneous and tolerably thick. The longitu- 

 dinal muscles are not very strong and cannot be said to form a cir- 

 cumscribed pennon. The ]>arieto basilars form folds uj)on the surface 

 of the mesenteries, the edge of the fold sometimes, however, uniting 

 with the mesentery and so producing one or more cavities enclosed 

 within the mesoghea of the mesentery near the insertion into the 

 column wall. No ripe reproductive elements were present, but I suc- 

 ceede<l in linding a few very young mother cells, tluunacerated con- 

 dition of the internal i>arts jireventing, however, an accurate determi- 

 nation of their distribution. Some certainly occurred on one of the 

 mesenteries of the second actual cycle and 1 thought 1 c(tuld distin- 

 guish others on some mesenteries of the third and fourth cycles, but 

 of this 1 can not be certain. 



I assign this form jirovisionally to the genus AncmonUi. It differs 

 materially, however, from the tyi»ical forms of thegrou}), as, for instance, 

 iu the short and not numerous tentacles. The abnormal arrangement 



