236 M. Sundevall on the Birds of Calcutta. 



would light towards evening upon the vessel. On two occasions 

 I nearly caught them with my hands. The English^ and seamen 

 in general, call them Boobies*. 



♦ The species of this genus known to me are the following: — 



1. Dysporus hassanus, 111. Pelecaaus bassanus, L. Sula alba et S. bas- 

 sana recenliorum. Gula pluniata, linea media nuda. Genae quoque plu- 

 matae limes faciei ad os angulutns, &c. Reliquis major. In Marl Atlantico 

 Septentrionali. 



2. D. capensis, Licht. Berl. Verz. p. 86. " Albus remigibus omnibus et 

 rectricibiis nigris, scapis basi albis. D. bassano paulo minor, 34 poll." (i. e. 

 36 poll. Suec.) Gula, Facies, 



This species is seen at all seasons on the great banks oflf the south extre- 

 mity of Africa. It is easily known from the following by its greater size 

 and more stretched-out form ; it also moves its wings more during flight, 

 instead of occasionally holding them still. I have only seen this bird at a 

 distance, and always (in October and August) of a pure white and black. 



3. D. cyanops, n. (Physiogr. Tidskr. pi. 5). Gula genisque nudis, facie- 

 que caeruleis, cauda rotundata, 



? (ad aequatorem maris Atlant. d. 6 Sept.). Alba ; dorsum et colli latera 

 plumis nonnullis fuscis. Alarum tectrices minores albse, immixtis aliis 

 fuscis ; majores omnes nigro-fuscse. Remiges omnes nigro-fuscse, basi intus- 

 que allDse. Rectrices fuscae basi albidae. Iris flavissima. Facies et rostrum 

 ultra medium caerulea; apex olivaceus. Pedes olivacei membrana fusca. 

 Long. 30 poll. Sv., ala 420 millim., rostrum e fronle 100, cauda 170, tar- 

 sus 52, digitus medius 70, cum ungue 82. (Alae extensse 5 ped. 3 poll., 

 truncus 10 poll,, latit. 5, altit. 4.) 



Junior^, (eodem loco et tempore anni). Differt magnitudine paullo minore, 

 rostro ex apice fere ad basin olivaceo, dorso toto fusco, alis magis fuscis, 

 collo et capite totis sordide albis, nee fusco-maculatis. 



jidultus albus, remigibus caudaque nigris (tantum procul visus). 



Pulliist fere totus cinereo-fuscus, do. 



Limes faciei ut in D. piscatore, sed pone oculos non sinuatus. Rostrum 

 crassius, fere 4-gono pyramidale, apice leviter deflexo. Ala ad ^ excedit 

 anum. Cauda submollis, alam perparum (1 poll.) superat. 



Anatomia feminae supra descriptae. (Esophagus maxime extensilis. Ven- 

 triculus magnus, oblongus, sacciformis, fere cutaneus, strato musculari ob- 

 soleto^ Pars glandulosa nulla constrictione distincta, fere dimidiam partem 

 superiorem ventriculi constituens ; glandulae cylindricae, altit. 3 millim., in 

 tres areas, lineis angustis laevibus distinctas, congestae, limite undique defi- 

 nito. Intestlnum totum longit. 80 poll, exit e latere apicis ventriculi ; duo- 

 denum longissimum : 20 poll, ad uisertionem ductus hepatici. Int. casca 2 

 parva, 3 poll, ab ano sita. Cloaca interne sat glandulosa. Hepar magnum, 

 substantia molli, lobis fere separatis, elongatis ; sinistro 1 poll, pone apicem 

 sterni extenso, 2 poll, breviore quam dextro. — Vesica fellea ut in plerisque 

 natatoribus. Pancreas e laciniis duabus omnino separatis, linearibus, exitu 

 cum hepatis communi. Cor simile Alcce et Urics. — Musculi et nervi evi- 

 dentissimi ob pinguedinem vix uUam. Sternum longum carina huniili. 

 Collum angulis duobus definitis ut Z flexile. Cranium postice strictura 

 profunda. 



This species occurs in the Atlantic Ocean near the equator. I have not 

 seen it elsewhere, but when I crossed this region (on both occasions in Sep- 

 tember) it occurred in considerable plenty. In this part of the ocean no 

 banks are marked in the charts, though I suspect that the depth is in some 

 places not great (perhaps not more than 50 or 100 fathoms), both from the 

 occurrence of these birds in that region, and from the sea wanting the clear- 



