Bacillariese, Naviculacese, Pleurosigma. 257 



Hab. in aquis submarinis et ad oras Danise, Hibernia?, Anglise, 

 Galliee australis. 



83. Pleurosigma tropicum Grun. in Wien. Verhandl. 1860, p. 559, 1083 

 t. 3, f. 34, Cl. et Grun. Arct. Diat. p. 58, Perag. Pleuros. t. 8, 



f. 7. — E majoribus, valvis lanceolato-sigmoideis, 150-260-22-30, 

 apicibus obtusis; rhaphe sigmoidea, nodulo centrali mediocri, or- 

 biculari ; striis transversis 21-23 in 10 u. , longitudinalibus parum 

 tenuioribus et remotioribus. 



Hab. ad oras Antillarum et in mari rubro. — Cplor frustuli 

 exsiccati pallide flavescens. An Pleurosigmatis strigilis W. Sm. 

 forma paullo delicatius striata ? 



84. Pleurosigma Baileyi Grun. in Cl. et Grun. Arct. Diat. p. 59, Pe- io84 

 rag. Pleuros. t. 8, f. 11, Pleurosig?na inflatum (Shadb.) Bail. in 

 Boston Journ. of N. S. VII, t. 7, f. 17? vix Shadb. in Trans. Micr. 

 Journ. II, 1854, p. 16, t. 1, f. 9, Pritch. Inf. p. 918. — Valvis 

 obtuse lanceolatis, sigmoideis, 80-130- 18-21, rhaphe paullo minus 

 quam lateribus valvas incurva, prope apices lateraliter decurrente; 

 striis transversis in valva* medio radiantibus 14-16, in apicibus 



18 in 10 u. ; striis longitudinalibus 18 in 10 u. 



Hab. in aquis subsalsis Bengaliae (Grunow); ad « Natal » Africae 

 (?Shadbolt). 



85. Pleurosigma Grovesii Cleve in Perag. Pleuros. t. 8, f. 1 et in 1085 

 litteris mihi a Peragallo missis. — E maximis, valvis modice sigmoi- 

 deis, 620 s 45, apicibus subobtusis, rhaphe centrali, nodulo centrali 

 elongato, area hyalina irregulari cincto; striis longitudinalibus 13, 

 transversis 9 in 10 u. 



Hab. ad ins. «Java» et ad «Singapore» (Cleve). 



86. Pleurosigma longissimum Cleve On some new or little known 1086 

 Diatoms p. 6, t. I, f. 8, Perag. Pleuros. t. 7, f. 16. — Valvis lon- 

 gissimis, angustis, linearibus, 170 ~ 8-8,5, apicibus obtusis, rhaphe 

 medio recta, in ultima tertia parte (e nodulo centrali) incurva; striis 

 sub angulo recto intersectis, transversis 18 { / 2 , longitudinalibus 21 



in 10 u. 



Hab. ad insulas balearicas, raro (Soederlund). — Frustuli color 

 pallide stramineus. — An Donkinia? 



87. Pleurosigma staurophorum Grun. in Cl. et Grun. Arct. Diat. p. 61. ios7 

 — Valvis lanceolato-sigmoideis, acutiusculis, 1 12-113 - 14, rhaphe 

 modice lata, symmetrica, nodulo centrali majusculo paullo oblongo, 

 lineis longitudinalibus duabus valvam totam in partes tres subaequa- 



les dividentibus; striis transversis parallelis, 14 in 10 u. 



17 



