194 Bacillariea3, Naviculaceae, .Dictyoneis. 



2. Dictyoneis Thumii Cleve in Diatomiste 1890, n. 2, p. 15. — Val- S35 



vis ellipticis lanceolatis, 150 - 32, apicibus , pseudo-loculis (cel- 



lulis Cl.) valvse circiter 11 in 10 /x„ marginalibus 4-5 in 10 u. ; 

 striis transversis strati inferioris (interioris) 25 in 10 u. 



Hab. in storaacho Holothurise in raari Sinensi (Thum). 



Seciio II. Pseudodiploneis (A. Schm.) : Valva? medio plus minus constrictae. 



3. Dictyoneis jamaicensis (Grev.) Cleve in Diatomiste 1890, pag. 15, 836 

 Mastogloia reliculata Perag. Diat. Villefr. 1888, p. 44, t. 2, f. 10, 

 non Grun. 1877, Navicula ceylanensis Leud.-Fortra. Diat. Ceyl. 

 1879, p. 26, t. 2, f. 25?, Navicula jamaicensis Grev. in Trans. Micr. 

 Soc. 1868, p. 126, t, 12, tig. 23. — Valvis elongatis, 100 *. lon- 

 gis, medio profunde constrictis, lobis oblongo-ellipticis, ad apices 

 paullo productis obtusisque; structura subtiliter punctata, punctis 

 quincuncialiter dispositis, serie puncforum parvorura 6 in 10 u. 

 secus marginem dkposita. 



Hab. ad insulas Antillas (Greville) ; in mari mediterraneo ad 

 insulas Balearicas et ad « Villefrauche» (Peragallo), ad Alexau- 

 driara JEgypti (Deby); in mari adriatico (Thum). 



4. Dictyoneis panduraeformis Cleve in Diatomiste 1890, pag. 16, Ma- 837 

 stogloia pandurcvformis Cleve On some new or little known 

 Diatoms 1881, p. 3, t. I, f. 1. — Valvis panduraeformibus, 97-9S 



« 27, ad cunstrictionem 19,5 y.. latis, apicibus cuneatis, margine 

 loculis subdistantibus (medio excepto in utroque latere uoduli cen- 

 tralis nullis vel indistinctis), superficie valv^e punctis parvis irre- 

 gulariter sparsis striisque subtilissirais 20 in 10 u.., parallelis, pun- 

 ctatis ornata; striis totam valvse superficiem, area parva circa 

 rhaphen rectam nodulumque centralem excepta, obtegentibus; no- 

 dulis terminalibus in directionem oppositara dispositis. 



Hab. ad insulas gallapagenses, rarissime (Exped. Eugenie). 



5. Dictyoneis Pantocsekii Cleve in Diatomiste 1890, n. 2, p. 16, Na- ?3? 

 vicula mastogloidea Pant. Foss. Bacill. Ung. II, 1889, t. 26, f. 387 

 nec I, 1886. — Valvis medio parum constrictis, pseudoloculis (cel- 

 luiis Cl.) 17 in 10 y.., marginalibus 5 in 10 a. ; striis transversis 



25 in 10 u. 



Hab. fossilis in depositu ad «Bory» Hungariae (J. Pantocsek). 



6. Dictyoneis marginata (Lewis) Cleve in Diatomiste 1890, p. 16 (f. 839 

 /i/pica), Navicula marginata Lewis in Micr. Journ. 1862, p. 161, 



N. aud U. Sp. p. 62, t. 2, f. 1 uee Navicula (Pinnularia) margi 

 nata O' Meara!, Navicula strangulata Grev. in Trans. Micr. Soc. 



