116 DEPARTMEyr OF THE X AVAL SERVICE 



indices are noted. In authors' notes a still neater formula is used; a method of indi- 

 cating by formula the general shape, smooth areas, ribs, striae, etc., has not yet been 

 satisfactorily devised. Such formulae are very time saving and luminous. But it 

 is difficult to construct them out of the characters in the ordinary printer's font. 



1. Diatoms (Marine) from the Magdalen Islands. 



Acnanthes lanceolata (Breb) Grun. 

 Actinoptychus undulatus Kutz. 

 Amphiprora (Tropidoneis) lepidoptera Bail. 

 Amphora augusta Greg. var. ventricosa Greg. 

 " arenaria Donk. 

 " cingulata Cleve. 



" ocellata var. ' . 



" ostrearia Breb. var vitrra. CI. 

 " ovalis var. offinis Gran. 

 " proteus. Greg. 

 JBiddulphia aurita Breb. 



" pulchella Gray. 

 Cocconeis scutellum E. var. 

 Coscinodiscus concavits. Greg. 

 " concinnus W. S. 



" nitidus Greg. 



, " oculus-iridis Ehr. 



" scintiUans Grev. var. 



Cymhella tumida Breb. 

 Encyonema gracile Rhab. 



" ventricosutn Ktz. 

 Eunotia pectinaUs var. undulata Ralf. 



" triodon Ehr, 

 Grammatophora oceanica Ehr. 



" manna Ktz. 



Hantzschia marina Ktz. 



" virgata? 



Gomphonema acuminatum Ehr. , 

 Hyalodiscus 

 Mastogloia exigua Low. 

 Melosira sulcata Ktz. var. 

 " scalans. 

 " nummuloides Ktz. 

 Navicula ahrupta var. Atlatitica A.S. 



" arenaria Donk? 

 (Trachyneis) aspcra var. pulchella CI. 

 " Brehissonia Ktz. 



" hrevis var. elliptica Y. H. 



" cancellata Donk. var suh-apicidala. (^ruii. ' 



(Trachyneis) clepsydra Donk. 

 " consanguinea CI? 



" crahro var. perpusilla CI. 



" cruciformis Donk. 



" cyprinus Sm. 



" digitoradiata Greg. • 



" Lyra var. intermedia Per. 



" directa Sm. 



