16 MARINE AND FISHERIES 



5 GEORGE v., A. 1915 

 Plate I. Fig. 10. Chaetoceros. 



In this form the frustules are in lateral view elliptical in outline, the lateral 

 bristles, which are smooth, arising without curvature from between the convex 

 apposed surfaces of the valves. The terminal awns are straight and filiform, 

 diverging at an angle of about 45°. It is probably another variety of C. chrio- 

 phyllum — Cast. 



Plate I. Fig. 11. Chaetoceros Peruvianum — Bright? 



This form is remarkable in the fact that the awns, which arise in pairs from 

 each joint of the chain, are noticeable for their length and stoutness, as well 

 as for their spinous character. The portions of the spines nearest to the chain 

 are small, numerous and thick-set, but, like the spines themselves, become larger 

 as the distance increases, as well as more widely separated. The terminal ap- 

 pendages are much shorter, smooth (?) and sigmoid, resembling a pair of horns. 

 The form would seem to be nearly related to Chaetoceros Peruvianum, Bright, of 

 the North Atlantic. 



Plate II. Figs. 1-7. Rhizosolenia. 



This genus differs from the ordinary type of Diatoms even more widely than 

 does the genus Chaetoceros, the most noticeable features being the great elongation 

 of the cylindrical frustules, the crossing of the latter by distinct transverse lines or 

 annuli, and the frequent presence of a calyptriform base, terminating in one or 

 more short but conspicuous spines. 



At least three different species of the genus have been observed in the waters 

 of the Bay of Fundy and the Gulf of St. Lawrence. 



Plate II. Figs. 1-2. Rhizosolenia setigera — Bright. 



What is believed to be this species has been observed in Passamaquoddy Bay, 

 St. John Harbor and Bathurst, as well about the shores of Prince Edward Island. 

 The figures here given are .taken from those of Prof. Ramsay Wright, who refers 

 especially to the peculiar spear-blade-like enlargement about the middle of the 

 length of the terminal spines (Fig. 2). I have also observed this feature in some 

 instances, but it does not seem to be a constant characteristic, and is given in only 

 one of Dr. Ramsay Wright's figures. 



Plate IL Figs. 3-4. Rhizosolenia styliformis — Bright. 



Prof. Ramsay Wright refers to this species as being the most abundant at 

 Canso, N.S,, but on the New Brunswick coasts it seems to be less common than the 

 preceding species. It has been found as yet only in St. Andrews Harbor. Figs. 3 

 and 4 show its general appearance, as well as the peculiar character of the cell 

 junctions. (Fig 4a). 



