266 MEMOIRS OF THE UNIVERSITY OF CALIFORNIA 



Dimensions. — Length, 8-17,"; transdiameter, 6-1 2^^; diameter of nucleus, 4i". 



Occurrence. — Figured by Maskell (1887) from the "Wellington district of 

 New Zealand. The only other occurrence recorded is liy Klehs (1912) as G. 

 minimum from fresh water in the Botanical Gardens at Buitenzorg, Java. 



Synonymy. — Gijmnodinium minimum, described by Klebs (1912) from 

 Buitenzorg, Java, is undoubtedly the same form described earlier by Maskell 

 (1887) from New Zealand. 



Until the complete life history of the Dinoflagellata has been worked out in 

 a sufficiently large number of species to allow of generalizations for the whole 

 group the exact allocation of many of the smallest forms described can be made 

 only tentatively. It is probable that some of these minute species, like G. 

 minimiDi) , may prove to be only a stage in the development of some larger form. 

 Its small size places it near the bottom of the list in this respect in Gymnodiniiun, 

 if not, indeed, among all Dinoflagellata. Its rod-shaped green chromatophores 

 allv it to G. viride. 



Gymnodinium vestifici Sehiitt 



Text figure Y, 10 



Gymnodimum vestifici Sehiitt (1895), pi. 25, fig. 85. 



G. vestifici, Lemmermann (1899), p. 358. 



G. vestifici. Lohmann (1908), pp. 252, 268, 368, table B; (1911), p. 31. 



G. vestifici, Paulsen (1908), pp. 97, 98, fig. 134. 



G. vestifici, Ostenfeld (1913), p. 338. 



Diagnosis. — A small species with fusiform body, its length 3.13 transdiam- 

 eters ; girdle anterior, displaced its own width ; sulcus short on both epicone and 

 hypocone ; surface striate on hjq^ocone. Length, 47a'. Atlantic or Mediterranean 

 at Naples. 



Description. — The body is fusiform, pointed at both ends, more tapering anteriorly, its 

 length 3.13 transdiameters at its widest part. The hypocone exceeds the epicone in length by 

 0.55 its own length. The epicone is short, with a length on the left and right sides of 0.25 and 

 0.34 respectivel.v of the total length of the body. It is asymmetrically rounded anteriorly with 

 a pointed apex which is exeentrieally deflected dorsalward. The hypocone is slightly broader 

 than and over twice the length of the epicone, and in ventral view is less pointed with blunt 

 antapex. 



The girdle is placed in tlie anterior third of the body, joining the sulcus proximally about 

 0.25 and distaUy 0.34 of the total length of the body from the apex. It traverses a descending 

 left spiral course, displaced its own width. Tlie furrow is wide. 0.28 transdiameter, and deeply 

 impressed. The sulcus is very short, extending but a short distance on either side of the girdle 

 in a narrow slightly siiuious line. The flagella and flagellar pores were not observed by Sehiitt 

 (1895). 



The nucleus is a small ellipsoidal body found in tlie region of the girdle. Its major and 

 minor axes are about 0.46 and 0.36 transdiameter in length respectively. It is filled with coarse, 

 chromatin granules. A few refractive rodlets are noted in the mid and anterior regions, and in 

 the peripheral laj'cr many minute spherules are present. The surface of the hypocone is striate, 

 with longitudinal lines, but none are figured for the epicone. 



