344 Notes on New Species 



Fig. 70. NiTscHiA OBLONGA, L. W. B., nov. sp. Small, 

 linear, with sub-acute apices ; valves a little narrower in 

 the middle than at the ends, but with no central constric- 

 tion ; marginal puncta small, close ; surface minutely 

 punctate in transverse parallel striae. 



Hub. Para River. 



Fig. 71-73. Zygoceros he.mitropus. Bail., nov. sp. ? = 

 BiDDULPiiiA HEMiTROPA, L. W. B. Frustulcs large, tur- 

 gid ; lateral valves minutely punctate in rows, with coni- 

 cal processes ; processes of one valve at right angles to 

 those of the other ; lateral view minutely punctate, circu- 

 lar, with two processes ; median band straight or undulate, 

 finely striated. 



Hah. Para River, and Lat. 0° 45' 50" S., Long. 45° 11' 

 25" W. 



This species is almost identical with a form figured in 

 Smith's Synopsis as Biddtdphia radlatus. This, however, 

 has no trace of the spines there figured. My father has 

 marked in Smith's Synopsis the name B. radiatus as in- 

 correct, substituting for it that of Eupodiscus radiatus, and 

 perhaps the above form should be referred to the same 

 genus. It is very abundant in the soundings from the 

 Para. 



Fig. 74. DicLADiA ? . I have already spoken of 



this form under Fig. 41. It occurs in the Para quite com- 

 monly. 



Fig. 75. GoMPHONEMA . This form was doubt- 

 fully referred to Gomphonema sphcerosphorum, Ehr., but as 

 I have been unable to find the original form, or any very 

 like it, I cannot compare them. The stria; are transverse, 

 and not very close. 



Fig. 76. NiTscHiA PUNCTATA, BaiI. = 'N. Brtghtwel- 

 Lii ? Kitton. I cannot discover any essential ditlerence be- 

 tween the forms of these two species, and they arc probably 

 identical. N. Brig/Uwcllii is reprcf^ented in Pritchard's 



